There is a similar tale about Dowth ("Dubhadh"), one of the other Boyne Valley tombs. It tells how king Bresal compels the men of Ireland to build a tower to heaven within a day. His sister casts a spell, making the sun stand still so that one day lasts indefinitely. However, Bresal commits incest with his sister, which breaks the spell. The sun sets and the builders leave, hence the name "Dubhadh" ('darkening'). This tale has also been linked with recent DNA analysis, which found that a man buried at Newgrange had parents who were most likely siblings (see #Construction and burials).