Donn

In Irish mythology, Donn ("the dark one", from ) is an ancestor of the Gaels and is believed to have been a god of the dead. Donn is said to dwell in Tech Duinn (the "house of Donn" or "house of the dark one"), where the souls of the dead gather. 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. Provided by Wikipedia