UI's Celtic Mythology - Irnan

Irnan, in Irish mythology, was a witch who once spun a magic web to catch some members of the Fianna, or Fenians, the bodyguard of the High King of Ireland. When this plan failed, Irnan changed herself into a monster and challenged any one of the Fenians to single combat. Finn MacCool, the leader of the Fenians, stepped forward but was persuaded that it would not be heroic enough for a warrior of his stature to fight a hag, even if she was in the form of a monster. So another Fenian, Goll, slew Irnan and as a reward Finn alloweed him to marry his daughter.

Obviously very generous people. Get the job done, get to marry someone's daughter! You can't beat that system...