The House of Wisdom (Arabic: بَيْت الْحِكْمَة Bayt al-Ḥikmah), also called the Grand Library of Baghdad, was a public school and library during the Abbasid period in Baghdad. It was one of the largest public libraries in the world during the Islamic Golden Age. It was either created as a library to hold books collected by the fifth Abbasid caliph, Harun al-Rashid (ruled 786–809), in the late 700s or as a private collection of the second Abbasid caliph, al-Mansur (ruled 754–775), to store rare Arabic-language books. Later, during the reign of the seventh Abbasid caliph, al-Ma'mun (ruled 813–833 AD), it became a public school and library.

The House of Wisdom was destroyed in 1258 during the Mongol attack on Baghdad. Information about it comes from sources written between the late 700s and the 1200s, including references in the book al-Fihrist by Ibn al-Nadim (died 995).

Recently, some historians have questioned whether the House of Wisdom was truly a major center for learning and played a large role in the translation movement. They believe this idea may have been created by European scholars in the 1800s and early 1900s and later included in many books and studies until more recent research examined the evidence again.

Background

The House of Wisdom was part of a major Translation Movement during the Abbasid Era. It translated works from Greek and Syriac into Arabic. However, it is unlikely that the House of Wisdom was the only center for this work. Translation efforts in Cairo and Damascus began before the House of Wisdom was created. This movement helped increase original research in the Muslim world, which had access to texts from Greek, Persian, and Indian sources. The rise of advanced research in mathematics, astronomy, philosophy, and medicine marked the beginning of Arabic science. This growth increased the need for more and updated translations.

The House of Wisdom was made possible by the steady movement of Arab, Persian, and other scholars from the Islamic world to Baghdad. This was because Baghdad was the capital of the Abbasid Caliphate. Evidence of this is the large number of scholars known to have studied in Baghdad between the 8th and 13th centuries, including al-Jahiz, al-Kindi, and al-Ghazali. These scholars contributed to an active academic community in Baghdad, producing many important works, even without a formal academy. Scholars linked to the House of Wisdom worked in fields such as philosophy, mathematics, medicine, astronomy, and optics.

The early name of the library, Khizanat al-Hikma ("Storehouse of Wisdom"), came from its role in preserving rare books and poetry. This was its main purpose until its destruction. Inside the House of Wisdom, writers, translators, scientists, scribes, and others met daily to translate, write, read, and discuss ideas. Many books and documents covering scientific and philosophical topics in different languages were translated there.

History

From the 4th to 7th centuries, scholars in the Arabic world began new studies or continued work started during the Hellenistic period. Important places for learning and sharing knowledge included schools like the School of Nisibis and the School of Edessa, as well as the famous hospital and medical center at Gondishapur. Libraries such as the Library of Alexandria and the Imperial Library of Constantinople were also key. Other centers for translation and learning existed in cities like Merv, Salonika, Nishapur, and Ctesiphon, which is near where Baghdad later developed.

During the Umayyad era, Muawiyah I gathered books in Damascus and created a library called "Bayt al-Hikma." Scholars collected and translated works from Greek, Latin, and Persian in areas like medicine, alchemy, physics, and mathematics. The Umayyads also adopted paper-making techniques from China and brought together scholars from different backgrounds, including Christian and Persian experts, to translate texts into Arabic and create new knowledge. These efforts helped the Arab world grow in learning and scholarship.

In 750, the Abbasid dynasty took over from the Umayyads. In 762, the Caliph al-Mansur built Baghdad as his capital instead of Damascus. Baghdad’s location and diverse population made it a strong center for trade and learning. The Abbasids, influenced by Persian traditions, translated foreign texts into Arabic. Al-Mansur created a palace library inspired by the Sasanian Empire’s library and supported scholars financially and politically. He also invited scholars from India and other regions to share knowledge about math and astronomy with the Abbasid court.

During the Abbasid Empire, many books from Greek, Chinese, Sanskrit, Persian, and Syriac were translated into Arabic. The Translation Movement grew stronger under Caliph Harun al-Rashid, who supported scholarship and poetry. Early translations focused on medicine, math, and astronomy, but later included philosophy. Harun al-Rashid’s library, called Bayt al-Hikma, was the direct predecessor to the House of Wisdom.

Under Caliph al-Ma'mun, support for the House of Wisdom and scholarship increased greatly. Al-Ma'mun, who learned the Quran by heart under the guidance of a religious leader, was known for his love of science. He valued scientific texts as much as wealth, and society began to see knowledge as highly valuable. Scholars and translators could earn a living, and being an academic was a respected position. Books and ancient texts were sometimes taken as prizes in wars. For example, Ptolemy’s Almagest was used as a condition for peace after a war with the Eastern Roman Empire.

The House of Wisdom was not just a school but also served many roles in Baghdad. Scholars worked as engineers, architects, and public officials. They also acted as doctors and advisors. Al-Ma'mun often visited the House of Wisdom, talked with scholars, and joined debates. He was inspired by a dream in which Aristotle visited him and discussed what was good. This inspired him to hold debates and seminars with experts in Kalām, a form of philosophical discussion. He organized groups of scholars to work on major projects, such as mapping the world and studying the Almagest. He also promoted Egyptology and helped build the first astronomical observatories in Baghdad.

Al-Ma'mun sent scholars from the House of Wisdom to collect texts from other countries. One leader was sent to Constantinople for this purpose. Sahl ibn Harun, a Persian poet and astrologer, was the chief librarian. Hunayn ibn Ishaq, a Christian physician and translator, produced 116 works, including translations of Greek medical texts by Galen and Hippocrates. Thābit ibn Qurra translated works by Apollonius, Archimedes, Euclid, and Ptolemy. These translations were better than earlier ones because the Abbasid tradition required more accurate translations and new ideas. By the late 9th century, the House of Wisdom became the world’s largest library and a major hub of learning. Though universities did not exist yet, knowledge was passed directly from teachers to students. Maktabs (early schools) began in the 9th century, and in the 11th century, Nizam al-Mulk founded the Nizamiyya of Baghdad, one of the first higher education institutions in Iraq.

The House of Wisdom thrived under al-Ma'mun’s successors, al-Mu'tasim and al-Wathiq, but declined under al-Mutawakkil. Al-Ma'mun, al-Mu'tasim, and al-Wathiq supported the Mu'tazili sect, which encouraged open thinking and scientific study. However, al-Mutawakkil, who ruled later, did not share this support, leading to the House of Wisdom’s decline.

Main activities

The House of Wisdom was a place where scientists, scholars, and translators worked together. It had a library that stored important knowledge from the Abbasid Empire. Scientists studied alchemy, which later helped create modern chemistry. The House of Wisdom also helped with astronomy and other scientific experiments.

Al-Ma'mun helped set up the House of Wisdom. He encouraged people to copy Greek scientific and philosophical works. He also brought important books from Byzantium to the library.

The House of Wisdom was more than just a library. Many new scientific and philosophical ideas were created there. Scholars used these ideas to study astronomy and confirm information from earlier scientists.

The Translation Movement lasted for two hundred years and helped increase scientific knowledge during the golden age of Arabic science. Ideas from Greece, India, and Persia were translated into Arabic. This helped the Islamic Empire learn more about science, medicine, math, and engineering. Scholars wanted to create a library with all the knowledge they collected.

At the House of Wisdom, scholars translated Greek texts into Arabic. The first translation was of Aristotle’s Topics. By the time of al-Ma'mun, Greek texts had been translated three times. Important authors like Aristotle, Galen, and Aryabhata had their works translated. Books about medicine, agriculture, and engineering were also translated.

Scholars made new discoveries that led to updated translations and explanations of old works. Some names and terms were changed, like the title of Ptolemy’s Almagest, which came from Arabic.

Scholars at the House of Wisdom also created original research. For example, al-Khwarizmi helped develop algebra. Another scholar, al-Kindi, introduced Aristotle’s philosophy to Arabic-speaking people and combined it with Islamic ideas. Al-Jahiz studied biology and wrote Book of Animals, explaining how animals adapt to their environments.

Musa ibn Shakir and his sons, the Banu Musa, worked in the House of Wisdom. They translated Greek texts and contributed to astronomy and engineering. They wrote Book of Ingenious Devices, which described many tools, including an early programmable machine.

In medicine, Hunayn wrote about eye diseases. Other scholars studied infections and surgery. These works later became important medical textbooks in Europe.

Under al-Ma'mun’s leadership, large scientific projects were organized. He built the first astronomical observatory in Baghdad to test Ptolemy’s work. A team of scientists checked and improved Ptolemy’s data. Al-Ma'mun also ordered a project to measure Earth’s size and create a detailed map of the world.

In 828, Caliph al-Ma'mun ordered the construction of the first observatory in the Islamic world. Scholars from the House of Wisdom, like Yahya ibn abi Mansur and Sanad ibn Ali al-Alyahudi, led the project. The observatory was called Maumtahan Observatory and was located in al-Shammasiyya.

Other "Houses of Wisdom"

The House of Wisdom in Baghdad made an important contribution by influencing other libraries in the Islamic world. It is known for helping connect many people and empires through its focus on education and research. Throughout Islamic history, the House of Wisdom was respected and seen as a model for many libraries that came after it. Many libraries appeared during and after its time, and it was clear these libraries were inspired by the House of Wisdom in Baghdad. These libraries aimed to copy the helpful features that the House of Wisdom was known for worldwide.

Other places have also been called "House of Wisdom," but they should not be confused with Baghdad's Bayt al-Hikma.