Bresal Bó-Díbad, son of Rudraige, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He took power after killing his predecessor, Finnat Már, and ruled for eleven years, during which there was a plague on cattle (Old Irish bó díbad, "extinction of cows")[1] which left only one bull and one heifer alive.
A story about the passage tomb of Dowth (Dubhadh), in the Dindsenchas (lore of places), says that Bresal compelled the men of Ireland to build a tower to heaven within a day.
His sister cast a spell, making the sun stand still so that one day lasted indefinitely.
[3] It has also been linked with recent DNA analysis, which found that a man buried at nearby Newgrange had parents who were most likely siblings.