Dowth (Irish: Dubhadh) is an ancient passage tomb located near the River Boyne in County Meath, Ireland. It is one of the three major tombs in the Brú na Bóinne World Heritage Site, along with Newgrange and Knowth. These tombs were built around 3200 BC. Unlike Newgrange and Knowth, Dowth has mostly remained in ruins, though its smaller inner chambers are still mostly intact. In 1847, the Royal Irish Academy conducted an excavation that was poorly done, leaving a large hole in the mound that has never been fixed.

Description

The cairn or tumulus is about 85 metres (280 ft) in diameter and 15 metres (50 ft) high. It is surrounded by large kerbstones, some of which have decorations. Quartz stones were found outside the kerbstones, suggesting that the entrance to the tomb was once surrounded by shiny white stones, like those at Newgrange. Three stone-lined passages lead into the mound from the west. These include two passage tombs, called Dowth North and Dowth South, and a souterrain.

The longest passage, Dowth North, is 18.2 metres long and has three sill-stones. It ends in a cruciform (cross-shaped) chamber with a roof made of horizontal stones, unlike the arched roofs at Newgrange or Knowth. Dowth South is 3.5 metres long and ends in a roughly circular chamber with a modern concrete roof, as the original roof collapsed. In Dowth North, some upright stones in the passage and chamber are decorated with spirals, zigzag lines, diamond shapes, and rayed circles. A single stone basin, 1.4 metres by 1 metre in size, stands on the floor. The right-hand arm of the cross leads into a long rectangular chamber with an L-shaped extension, sometimes called "the annex." This may be the oldest part of the tomb, later incorporated into the cruciform design. The annex has a floor with a 2.4-metre-long flagstone containing an oval bullaun (a man-made depression). Until recently, visitors had to climb down a ladder in an iron cage and crawl over loose stones to reach the cruciform tomb. Now, access is limited, and all features are protected by metal grilles.

A kerbstone with cup-shaped marks, a spiral, and a flower-like design marks the entrance to Dowth South. While the current roof is modern, the original roof may have been arched, like those at Newgrange. This tomb has a few decorated stones and a large recess on the right side.

The third entrance on the west side of Dowth is an early Christian souterrain. It leads into the passage of Dowth North and was built around the 10th or 11th century. Historical records, such as the Annals of Ulster and the Annals of the Four Masters, mention Norsemen plundering the "cave" of Dowth around 862. The "cave" likely refers to the souterrain.

The mound originally had about 115 kerbstones surrounding it. One kerbstone, called Kerbstone 51 or the Stone of the Seven Suns, has several circular carvings arranged in a radial pattern, similar to those found at Loughcrew.

Archaeological investigation

Dowth was excavated in 1847 by the Royal Irish Academy. This poorly done excavation removed most of the mound’s center and used dynamite to break up the stones. The hole was never filled again, and some stones were later taken for use elsewhere. This large crater remains unrepaired to this day.

Unlike Newgrange and Knowth, Dowth has not been dated by independent experts. However, its features suggest it is part of the same group of passage tombs, which were built between about 3200 and 2900 BC. In 1970, archaeologist Peter Harbison estimated the tomb’s age to be between 2500 and 2000 BC.

From 2012 to 2015, archaeological and geophysical surveys were conducted occasionally across the entire site, including later monuments. In July 2018, a passage tomb near Dowth Hall was excavated. This discovery revealed examples of Neolithic rock art similar to those found at Dowth and other Brú na Bóinne sites.

Astronomical alignment

The monument shares a special astronomical alignment with its well-known neighbor, Newgrange. In The Stars and the Stones: Ancient Art and Astronomy in Ireland, Martin Brennan (1942–2023, an Irish-American writer and artist) describes a unique alignment. From November to February, the evening sun's rays enter the passage and reach the chamber of Dowth South. Brennan notes that during the winter solstice, the low sun's light travels along the left side of the passage, then enters the circular chamber, where three stones are illuminated. A curved central stone reflects the sunlight into a dark recess, revealing decorated stones there. After about two hours, the sun's rays slowly move back along the right side of the passage and then leave Dowth South.

Myth

The medieval Dindsenchas (a collection of stories about places) includes a tale about Dowth (also called Dubhadh). The story describes how King Bresal Bó-Díbad forced the people of Ireland to build a tower that reached the sky in one day. Since this was impossible, his sister used a spell to make the sun stop moving, creating a day that lasted forever. However, Bresal later married his sister, which broke the spell. The sun then set, and the builders left, leading to the name Dubhadh, meaning "darkening." This story is connected to the way the sun aligns with structures at Brú na Bóinne during solstices. It is also linked to a 2020 DNA study that found a man buried near Newgrange had parents who were likely siblings. This discovery suggests that knowledge of these events may have been remembered for thousands of years before being written down as a myth during the Middle Ages.