Hoel or Howel is a legendary king of Brittany and one of the oldest characters associated with Arthurian legend. He is the son of King Budic (or Boudicius) of Brittany, and serves as one of King Arthur's vassals and loyal allies. In Welsh literature, where he appears as Howel or Hywel, his father is named "Emhyr of Brittany," and certain legends pertain he was the father of Saint Tudwal.