One of Arthur’s warriors who was the son of Eri. Greid owned a hound named Drudwyn. As one of his tasks, the warrior Culhwch had to obtain this hound to help hunt the boar Twrch Trwyth. Greid was loyal to the warrior Gwythyr, and joined he Gwythyr’s army against Gwynn son of Nudd. Greid was taken prisoner by Gwynn and was not released until Arthur intervened.