Madoc ap Uthyr
In early Arthurian literature, Madoc ap Uthyr is the son of Uther Pendragon, brother to King Arthur and father of Eliwlod. He is memorialized with The Death Song of Madawg from the Book of Taliesin which laments his death at Erof's hands, and is also mentioned in the poem Arthur and the Eagle.
A Madawg's grave is mentioned in Englynion y Beddau, which states:
