A royal youth who lived in Carmarthen.

Envoys from King Vortigern - searching for a boy without a father, to sacrifice in an attempt to cure the problem having building his tower at Dinas Emrys - rode through Carmarthen and overheard Dinabutius, a royal youth, chiding another boy for having no father.

This drew the attention of one of Vortigern's counsellors to the other boy, who was Merlin. He was soon summoned to Vortigern’s court.