Beli Mawr (
Welsh for "
Beli the Great") was an ancestor figure in medieval
Welsh literature and genealogies. He is the father of
Caswallawn,
Arianrhod,
Lludd Llaw Eraint,
Llefelys, and
Afallach. In certain medieval genealogies he is listed as the husband of Anna, cousin of the
Virgin Mary. Other sources give his wife as
Dôn, daughter of Mathonwy. According to the
Welsh Triads, Beli and Dôn were the parents of
Arianrhod, but the mother of Beli's other children—and the father of Dôn's other children—is not mentioned in the medieval Welsh literature. Several royal lines in
medieval Wales traced their ancestry to Beli.