The Gaels are a group of people from the Celtic family who originally lived in Ireland, parts of Scotland, and the Isle of Man. They speak Gaelic languages, which include Irish, Manx, and Scottish Gaelic. These languages are part of the larger Celtic language family.
Gaelic language and culture began in Ireland and spread to an area called Dál Riata in western Scotland. In ancient times, the Gaels traded with the Roman Empire and also attacked Roman Britain. The Romans called them "Scoti." During the Middle Ages, Gaelic culture became widespread in Scotland and the Isle of Man. Some Gaels also lived in Wales, where they created small kingdoms, and in the Faroe Islands, where they may have been the first people. Gaelic missionaries helped spread Christianity in Northumbria and the Carolingian Empire. During the Viking Age, Vikings from Scandinavia attacked and settled in Gaelic lands, mixing with the Gaels to form a group called the Norse-Gaels. In the 9th century, the areas of Dál Riata and Pictland joined to create the Gaelic Kingdom of Alba, which is now Scotland. At the same time, Gaelic Ireland was divided into many kingdoms, with a High King claiming authority over them.
In the 12th century, Anglo-Normans conquered parts of Ireland, and some areas of Scotland were influenced by the Normans. Despite this, Gaelic culture remained strong in Ireland and in Scotland’s Highlands, Hebrides, and Galloway. By the early 17th century, the last Gaelic kingdoms in Ireland were controlled by England. King James VI and I tried to stop Gaelic culture by passing strict laws in Scotland, such as the Statutes of Iona, and by sending English and Scottish settlers to live in Gaelic areas of Ireland. Over time, the Gaelic language was discouraged and mostly replaced by English. However, Gaelic is still spoken in Ireland’s Gaeltacht and Scotland’s Gàidhealtachd (Outer Hebrides and parts of the north-west Highlands). Today, the descendants of the Gaels live in Wales, Scotland, England, the Americas, and Australasia.
Traditional Gaelic society was organized into clans, each with its own land and leader, chosen through a system called tanistry. The Irish were once pagans who worshipped many gods, honored their ancestors, and believed in an Otherworld. They celebrated four festivals each year—Samhain, Imbolc, Beltane, and Lughnasa—which are still celebrated today. The Gaels had a strong tradition of storytelling, passed down by people called shanachies. Writing in the ogham alphabet began in the 4th century. The Gaels converted to Christianity, which introduced writing using the Roman alphabet. Irish myths and laws, such as Brehon law, were recorded by medieval monasteries. Gaelic monasteries were important centers of learning and helped develop Insular art and Celtic Christianity. In the Middle Ages, many Gaels lived in roundhouses and ringforts. Their clothing styles were distinct: in Ireland, the léine croich (a saffron-colored shirt) was common, while in Scotland, the belted plaid (an early version of the modern kilt) was worn. Gaelic traditions, such as music, dance, festivals, and sports like Gaelic games in Ireland and Highland games in Scotland, continue to be important today. Gaelic culture remains a key part of Irish, Scottish, and Manx societies.
Ethnonyms
Throughout history, Gaels and people who spoke Gaelic have been called by many names. The most common names are Gael, Irish, and Scots. In Latin, they were called Scoti, but this name later only referred to the Gaels in Scotland. Other names, like Milesian, are not used as often. An Old Norse name for the Gaels was Vestmenn, meaning "Westmen" because they lived on the western edges of Europe.
The word "Gaelic" first appeared in English writing in the 1770s, replacing an earlier word, "Gathelik," which was used as early as 1596. The word "Gael," meaning "a member of the Gaelic race," first appeared in print in 1810. The term "Goidelic" has also been used in English since the 19th century, but it usually refers to the language group.
These names come from the Old Irish word Goídel/Gaídel. In Early Modern Irish, it was spelled Gaoidheal (singular) and Gaoidheil/Gaoidhil (plural). In modern Irish, it is spelled Gael (singular) and Gaeil (plural). Scholar John T. Koch suggests the Old Irish name was borrowed from an Archaic Welsh form, Guoidel, meaning "forest people," "wild men," or later "warriors." Guoidel is recorded as a personal name in the Book of Llandaff. The name's root is related to the Proto-Celtic word for "wild" and to the Old Irish word Féni, which comes from Proto-Indo-European *weidh-n-jo-. This word is the origin of Fianna and Fenian.
In medieval Ireland, bardic poets, who were the cultural leaders of the nation, used the term Gaoidheal only for those who claimed to be descendants of the mythical Goídel Glas. Even Gaelic-speaking Normans born in Ireland, who spoke Irish and supported Gaelic poetry, were called "Gall" (meaning "foreigner") by Gofraidh Fionn Ó Dálaigh, a 14th-century Chief Ollam of Ireland.
The word "Irish" has been used in English since the 11th century, in the form "Irisce," which came from Old English "Iras," meaning "inhabitant of Ireland," and from Old Norse "irar." The word "Ériu" in Old Irish, which means "fertile," is likely linked to the Proto-Indo-European term *pi-wer- and is mentioned as a goddess in the Lebor Gabála Érenn.
Ancient Greek writers, like Ptolemy, mentioned a group called the Iverni in southwest Ireland. This group is believed to be connected to the Érainn in Irish tradition. The Érainn included peoples like the Corcu Loígde and Dál Riata. Ancient Roman writers, such as Caesar, Pliny, and Tacitus, used the name "Hibernia" for Ireland, though the Romans often called the island "Scotia" and the Gaels "Scoti."
In Ireland, the term "Éireannach," meaning "Irish," only became a major political term in the 17th century, as seen in the works of Geoffrey Keating, who wrote about alliances between native Gaels and Normans against English settlers.
The Romans used the word "Scoti" in Latin from the 4th century onward to describe the Gaels, who were raiding the west coast of Britain. This term may have meant "raider" or "pirate." The word "Scot" was used for all Gaels, not just those in Scotland. Examples include Johannes Scotus Eriugena and the Schottenkloster, a monastery founded by Irish Gaels in German lands.
Between the 5th and 10th centuries, early Scotland was home to the Gaels of Dál Riata, the Picts, the Britons, the Angles, and later the Vikings.
Gaels in northern Britain called themselves "Albannaich" and their land the Kingdom of Alba, which followed the Dál Riata and Pictland kingdoms. Germanic groups often called the Gaels "Scottas." As Anglo-Saxon influence grew, the Latin term "Rex Scottorum" was used, and the land became known as Scotland. Over time, "Scot" and "Scottish" referred to all people in Scotland, regardless of language. Germanic-speaking people in Scotland called Scottish Gaelic "Erse," meaning "Irish."
Population
In traditional Gaelic society, a family group that traces its history through the father's side is called a clann or, in Ireland, a fine. These terms describe a large group of people who share a common ancestor, larger than a single family. These groups may include smaller family units called kindreds and septs. The word fine should not be confused with fian, which refers to a group of men who hunted, fought, or traveled together.
Using the Eóganachta, a group from the Munster region, as an example, members of this clann claim to be descendants of Éogan Mór. This group is further divided into smaller family units called kindreds, such as the Eóganacht Chaisil, Glendamnach, Áine, Locha Léin, and Raithlind. Each kindred includes smaller family groups called septs, which became Irish Gaelic surnames. For example, the Eóganacht Chaisil includes surnames like O'Callaghan, MacCarthy, and O'Sullivan.
The Irish Gaels can be grouped into major historical groups, such as the Connachta (including Uí Néill, Clan Colla, Uí Maine), Dál gCais, Eóganachta, Érainn (including Dál Riata and Dál Fiatach), Laigin, and Ulaid (including Dál nAraidi). In the Scottish Highlands, many Gaelic clans claimed to be descendants of these Irish groups, especially those from Ulster. For example, the Dál Riata (including clans like MacGregor and MacDuff) claimed to be from the Síl Conairi. Some groups that arrived in the High Middle Ages, such as the MacNeill and Buchanan clans, claimed to be from the Uí Néill. The MacDonalds, who took control of the Hebrides from the Norse-Gael MacLeod, claimed to be from Clan Colla.
A 2009 genetic study found that people living on the Atlantic edges of northwestern Europe, including the Irish, Scots, Welsh, Bretons, and Basques, have the highest levels of Haplogroup R-M269. This group is especially common among men of Gaelic ancestry, reaching 94% in western Ireland. The same study noted that the ability to digest milk as an adult and a condition called hereditary haemochromatosis are also most common among people of Gaelic ancestry.
In 2016, a study of ancient DNA from men buried on Rathlin Island between 2000–1500 BC showed they were genetically similar to modern Irish, Scots, and Welsh. These men belonged to Haplogroup R-L21 and had the gene for lactase persistence. One also had the gene for hereditary haemochromatosis. This suggests that genetic traits linked to the Gaels and the Insular Celts appeared about 4,000 years ago. The study’s authors believe the proto-Celtic language, which became the Gaelic languages, may have arrived around this time.
Advances in genetic research have helped scientists connect specific genetic groups with Gaelic family units and their surnames. For example, the Uí Néill (including O’Neill and O’Donnell) are linked to R-M222, while the Dál gCais (including O’Brien and McMahon) are linked to R-L226.
A 2017 study called the "Irish DNA Atlas" found that the Irish population can be divided into ten genetic groups. Seven of these groups are of Gaelic Irish ancestry, and three are of shared Irish-British ancestry. The Gaelic groups show small genetic differences that match historical regions of Ireland. The "Ulster" group, located in the northwest, is genetically most different from the British groups, as this area remained outside English control for the longest. A group in Argyll, Scotland, is also genetically closer to Gaelic Irish groups, as this region was historically Gaelic-speaking.
A common trait in Gaelic populations is red hair. About 10% of Irish people and at least 13% of Scots have red hair, and many more carry genes linked to this trait. This may be connected to adapting to the cloudy weather in these regions.
Census records in countries where Gaels live show how many people speak Gaelic languages (Irish, Scottish Gaelic, or Manx). Ethnic identity is more complex, but many people identify as Irish, Manx, or Scottish. Not all of these people are of Gaelic descent, especially in Scotland’s Lowlands. These numbers are estimates, as they depend on how people report their identity.
Today, the two largest Gaelic-speaking communities are Ireland and Scotland. As of the 2022 census, Ireland has 71,968 daily Irish speakers and 1,873,997 people who can speak Irish. Scotland has 58,552 fluent Gaelic speakers and 92,400 people with some Gaelic ability, based on the 2001 census. Gaelic is still spoken in western coastal areas and islands like the Hebrides in Scotland. Many Gaelic speakers now live in cities such as Glasgow, Edinburgh, Dublin, Cork, Donegal, and Galway. There are about 2,000 Scottish Gaelic speakers in Canada, mostly in Nova Scotia and Cape Breton Island. In the U.S., over 25,000 Irish speakers live in cities like Boston, New York City, and Chicago.
As the Western Roman Empire declined, the Irish and Anglo-Saxons took advantage of the situation in Great Britain starting around the 4th century. The proto-Eóganachta Uí Liatháin and the Déisi Muman of Dyfed established colonies in Wales. The Érainn’s Dál Riata settled in Argyll, eventually forming the kingdom of Alba. Gaelic influence also spread to Northumbria, and the MacAngus clan rose to power among the Picts by the 8th century. Gaelic Christian missionaries worked across the Frankish Empire. During the Viking Age, Irish people were taken as slaves and spread across Viking-controlled areas. This is why Icelanders have high levels of Gaelic DNA.
After Gaelic kingdoms fell, Gaels moved to other parts of the world under the Spanish
Origins
Gaelic culture and the Goidelic language are first recorded in Ireland, which suggests that it began there. Scholars disagree about when Ireland and Britain became Celtic. Some believe this happened with the arrival of the Bell Beaker culture during the Bronze Age, around 2400 BC. This culture brought people with Steppe/Yamnaya ancestry, which later became dominant. Archaeologist J. P. Mallory says the Bell Beaker culture and its spread of genes offer a simple explanation for the origins of Irish Gaelic. He notes that there is no evidence of large migrations to Ireland later, either through archaeology or genetics. A study of ancient DNA found that three men buried on Rathlin Island between 2000 and 1500 BC were genetically similar to modern Irish, Scots, and Welsh people.
Other scholars argue that Ireland became Celtic or Goidelic much later. Linguist Peter Schrijver says dates before 1000 BC are too early, as the earliest Goidelic writings show the language was still similar to other Celtic languages in the 1st century AD. He believes Celtic languages should have changed more over 2,000 years.
Mallory suggests a language shift occurred after 1400 BC. He thinks Goidelic was first spoken by a minority, such as a specific social group, and the pre-Goidelic people gradually adopted it because it offered advantages like access to goods, status, or security. He points to two periods when this might have happened: 1400–900 BC, when many hillforts were built, and the first few centuries BC, when royal ceremonial sites like Emain Macha, Dún Ailinne, and Tara were constructed. These sites later became associated with Gaelic tribes.
John T. Koch believes Goidelic developed from proto-Celtic during a time of isolation in Ireland at the end of the Bronze Age and beginning of the Iron Age, around 600 BC. He says Ireland and Celtiberia preserved a more traditional Q-Celtic language because they were not fully connected to the La Tène culture, which later spread the P-Celtic (Gallo-Brittonic) languages. Goidelic retains more ancient features than Brittonic, suggesting it is the older branch.
T. F. O'Rahilly proposed that the Irish people spoke a Brittonic (Brythonic) language before being conquered by Goidelic-speaking Gaels near the end of the Iron Age, around 100 BC. However, this theory has been rejected due to a lack of evidence for such an invasion or large migrations after the Bronze Age. Artifacts from this time, like La Tène and Romano-British items, came to Ireland from Gallo-Brittonic regions. The Celtic name Iverni dates back to the 4th century BC, and evidence shows the Iverni, who later became the Érainn, were the ancestors of the Gaels. The oldest direct evidence of Goidelic is in ogham inscriptions from Archaic Irish, which are most common in Iverni territory.
In medieval texts like the Lebor Gabála Érenn, the Gaels describe their origins as tracing back to an ancestor named Goídel Glas, a Scythian prince and grandson of Fénius Farsaid. He is said to have created the Gaelic languages. Goídel’s mother, Scota, was an Egyptian princess. The Gaels are described as wandering for centuries before reaching Iberia, where their king, Breogán, founded Galicia. They later sailed to Ireland from Galicia as the Milesians, the sons of Míl Espáine. The Gaels fought a battle of sorcery with the Tuatha Dé Danann, the gods who lived in Ireland. Ériu, a goddess of the land, promised the Gaels the land if they paid her tribute. They agreed, and their bard Amergin recited the Song of Amergin. The Gaels and the Tuatha Dé Danann divided the land: the Gaels took the world above, and the Tuatha Dé Danann took the world below (the Otherworld). The Gaels named the land Éire, which later became "Ireland" in English.
History
According to medieval Irish legend, High King Túathal Techtmar was sent away to Roman Britain before returning to claim the throne of Tara. Some modern historians, based on the writings of Tacitus, think he may be the same person as an "Irish prince" who was welcomed by Agricola, the governor of Britain, and suggest that the Romans may have supported him. His grandson, Conn Cétchathach, was the ancestor of the Connachta, a group that would dominate Ireland during the Middle Ages. The Connachta controlled the area now called Connacht. Their close relatives, the Érainn (both groups are descended from Óengus Tuirmech Temrach), and the Ulaid later lost power in Ulster to the descendants of the Three Collas in Airgíalla and Niall Noígíallach in Ailech, who expanded their influence.
The Gaels first appear clearly in historical records during the classical era, with ogham inscriptions and detailed mentions in writings by Greek and Roman scholars, such as Ptolemy. The Roman Empire conquered most of Britain in the 1st century but did not conquer Ireland or the far north of Britain. The Gaels had trade relationships with the Roman world, and Roman jewelry and coins have been found at several Irish royal sites. The Gaels, called "Scoti" by the Romans, also attacked Roman Britain, often with the Picts. These attacks became more frequent in the 4th century as Roman control in Britain weakened. During this time, Gaels lived in parts of Britain, such as Wales, where the Déisi founded the Kingdom of Dyfed and the Uí Liatháin founded Brycheiniog. Some Gaels also settled in Cornwall. In the north, the Dál Riata established a territory in Argyll and the Hebrides.
Christianity arrived in Ireland during the 5th century, most famously through Patrick, a former slave from Roman Britain, and also through Gaels like Declán, Finnian, and the Twelve Apostles of Ireland. Monks and abbots took over roles once held by the aos dána, such as druí and seanchaí, as literacy spread and oral traditions were written down. This meant that early Irish Christianity kept some Gaelic customs.
In the Middle Ages, Gaelic Ireland was divided into a system of territories ruled by kings or chiefs. The smallest unit was the túath (plural: túatha), usually the land of one family. Several túatha formed a mór túath, ruled by an overking. Several overkingdoms formed a cóiced (province), ruled by a provincial king. In the early Middle Ages, the túath was the main political unit, but over time, overkings and provincial kings gained more power. By the 6th century, Ireland was divided into two main regions: Leath Cuinn and Leath Moga. In the south, the Eóganachta, based at Cashel, grew in power, while Érainn clans like the Corcu Loígde and Clann Conla lost influence. The Déisi, descendants of Fiacha Suidhe and later known as the Dál gCais, helped expand Munster north of the River Shannon, laying the foundation for Thomond. The Uí Néill's southern branch also moved into Mide and Brega. By the 9th century, some of the most powerful kings were recognized as High Kings of Ireland.
Some people believe the 6th to 9th centuries were a Golden Age for the Gaels because of their influence across Western Europe through Christian missionary work. Like the Desert Fathers, Gaelic monks were known for their strict religious practices. Notable figures from this time include Columba, Aidan, and Columbanus. Gaelic scholars, who studied Greek and Latin during a time of cultural decline, gained recognition in the court of the Frankish Empire, such as Johannes Scotus Eriugena. At home, art like the Book of Kells and the Tara Brooch was created. Important monasteries founded during this time include Clonmacnoise, Glendalough, Clonard, Durrow, and Inis Cathaigh.
Early Icelandic writings, such as the Íslendingabók, suggest that Gaels may have visited the Faroe Islands and Iceland before the Norse, and that Gaelic monks called "papar" (meaning "father") lived there before the Norse arrived.
In the late 8th century, Norsemen from Scandinavia, known as Vikings, began attacking settlements in Ireland. The first recorded attacks were on Rathlin and Iona in 795. These attacks continued until the 840s, when the Norse settled in places like Dublin, Limerick, and Waterford, creating large slave markets. The Norse also took control of the Hebrides and the Isle of Man from the Dál Riata and established the Kingdom of the Isles.
The kings of Pictland, a region in northern Britain, were of Gaelic
Culture
Gaelic society was traditionally organized into groups called clans. Each clan had its own land and was led by a male chieftain or king. When a chieftain or king died, a relative known as a tanist (tánaiste) would take over. The tanist had to share the same great-grandfather as the previous leader and was chosen by free men who also shared that ancestor. Gaelic law, called Fénechas or Brehon law, was an important part of their society. The Gaels passed down their traditions through stories, which were kept alive by people called shanachies. In ancient and medieval times, most Gaels lived in roundhouses and ringforts. They wore clothing that later became the belted plaid and kilt in Scotland. They also had their own literature, music, dances (like Irish and Highland dancing), social events (such as Feis and Ceilidh), and sports (like Gaelic games and Highland games).
The Goidelic (Gaelic) languages are part of the Celtic language family, which evolved from an older language called proto-Celtic. Since the 19th century, the Gaelic languages have declined significantly, even though they were once widely spoken in Ireland and the Scottish Highlands. The English government tried to discourage the use of Gaelic for political reasons as early as 1366. Later laws, such as the Statutes of Iona in 1609, and groups like the Society in Scotland for Propagating Christian Knowledge, also contributed to this decline. As Gaelic aristocrats were replaced or assimilated, the language lost its status and became mainly used by peasants. The spread of English made it difficult for many people of Gaelic heritage to speak a Goidelic language.
In the 19th century, groups like Conradh na Gaeilge (the Gaelic League) were formed to help revive Gaelic culture and language. The Gaelic League, which started in 1893, aimed to promote Irish Gaelic, especially in areas called the Gaeltacht. While the league was not political, its ideals appealed to groups like the Irish Republican Brotherhood, who supported the Irish Revolution. Scottish Gaelic was less connected to political movements at the time, as Scottish nationalists focused more on historical figures like William Wallace.
In the 1950s, the Irish government created An Caighdeán Oifigiúil, a standard form of the Irish language based on local dialects. Students in Ireland were required to study Irish until 1973, and some schools, called Gaelscoileanna, teach entirely in Irish. In the Gaeltacht, the language faces challenges from globalization, but organizations like Údarás na Gaeltachta and government programs help support it. Media outlets like TG4 and RTÉ Raidió na Gaeltachta also promote the language. The last native speaker of Manx Gaelic died in 1974, but efforts to revive it continue. In Scotland, the Gaelic Language (Scotland) Act 2005 helped protect Scottish Gaelic, leading to more Gaelic-language education and media, such as BBC Alba and BBC Radio nan Gàidheal.
Before Christianity, the Gaels believed in an oral tradition that included animism (belief in spirits), polytheism (belief in many gods), ancestor worship, and hero cults centered on figures like Cú Chulainn and Fionn mac Cumhaill. They celebrated four seasonal festivals: Imbolc, Beltane, Lughnasadh, and Samhain. These traditions were recorded by monks who described them as "mythology." Important gods included the Tuatha Dé Danann, such as The Dagda, Lugh, The Morrígan, and Brigid. These deities were linked to specific roles, events, or qualities. Places like Brú na Bóinne, the Hill of Tara, and the Hill of Uisneach were important in Gaelic stories. The Otherworld, called Mag Mell or Tír na nÓg, was believed to be a spiritual realm where gods lived.
The Gaels adopted Christianity in the 5th century, and it remains the main religion today, though fewer people are religious now. Early Christians struggled to spread their beliefs in Ireland because it was a tribal society not part of the Roman Empire. Saint Patrick, a Briton who was once a slave in Ireland, helped introduce Christianity by using Gaelic traditions. The last pagan High King was Diarmait mac Cerbaill. The 6th–9th centuries saw a strong Gaelic Christian culture with many saints and religious art.
By the 12th century, the Catholic Church criticized Gaelic customs like polygamy and hereditary clergy, calling them "pagan." As the Church became more centralized, it promoted uniformity across Europe, which led to changes in Gaelic society. The Church also supported groups like the Normans, who influenced Gaelic regions. This shift marked the beginning of the decline of traditional Gaelic practices.