Donegild.Man of Law's Tale, Chaucer. The mother of Alla, king of Northumberland, hating Constance, the wife of Alla, because she was a Christian, she put her on a raft with her infant son and turned her adrift. When Alla returned from Scotland and discovered this cruelty of his mother, he put her to death. The tradition of St. Mungo resembles the Man of Law's Tale  in many respects.