An old knight who lived with his nephew, Danaim, and harbored sick and injured knights in his castle, including Tristan, Mordred, and Palamedes.
While Tristan was healing there, Daras discovered that Tristan had slain three of his sons at the Castle of Maidens tournament, and had maimed his other two. Enraged, he threw Tristan, Palamedes, and Dinadan into his prison. When Tristan grew deathly ill, Daras relented and released him on Tristan’s pledge of friendship.
He later became a Knight of the Round Table.
Source
Le Morte Darthur | Sir Thomas Malory, 1469-1470