In Irish mythology, Donn ("the dark one", from Proto-Celtic: *Dhuosnos)[1][2] is an ancestor of the Gaels and is believed to have been a god of the dead.[2][3][4] Donn is said to dwell in Tech Duinn (the "house of Donn" or "house of the dark one"),[5] where the souls of the dead gather.[6] He may have originally been an aspect of the Dagda. Folklore about Donn survived into the modern era in parts of Ireland, in which he is said to be a phantom horseman riding a white horse.
^Ó hÓgáin, Dáithí (1999). The Sacred Isle: Belief and religion in pre-Christian Ireland. Boydell & Brewer. pp. 27, 58.
^ abÓ hÓgáin, Dáithí (1991). Myth, Legend & Romance: An encyclopaedia of the Irish folk tradition. Prentice Hall Press. pp. 165–166, 154.
^Monaghan, Patricia (2004). The Encyclopedia of Celtic Mythology and Folklore. Infobase Publishing. p. 135.