Jaiant sans nom
A giant baptized and knighted by Arthur. The son of a dwarf, the Giant was suckled by a unicorn as a child, which turned him into a beast. Stupid and perpetually hungry, he killed men and animals indiscriminately.
The Giant and his father were stranded on an island for twenty years until Arthur happened to land there and rescue them.
See also
Unicorns | Myths and Legends
Source
Le Chevalier du Papegau | Late 14th century or early 15th century