A better-known figure of this name compelled his brother-in-law to designate Gwern as his heir.  
One figure of this name was a hero of the Bretons who died after being incorrectly informed that a ship with a black sail was approaching his prison, which meant that his mother had refused to ransom him.  In another legend, a figure of this name was the father of Caractacus who went with him to Rome, where St. Paul converted him to Christianity.  A better-known figure of this name compelled his brother-in-law to designate Gwern as his heir.  After this man's half-brother Efnisien died, a struggle broke out in which this son of Penarddun and Llyr was killed.  FTP, name this enormous figure from Celtic myth, whose name means "raven" and who had a magical head.
One figure of this name was a hero of the Bretons who died after being incorrectly informed that a ship with a black sail was approaching his prison, which meant that his mother had refused to ransom him.  
Bran