A king and brother of the barbarian King Milocrates.
When Milocrates’s island was invaded by Roman warriors, including a young Gawaine, he sent a message to Buzafarnan asking for help. Buzafarnan left immediately, but was held up by storms and arrived too late, meeting the victorious Roman fleet as it was leaving the island.
Through the heroics of Gawaine, Buzafarnan was killed and his ships were sunk by Greek Fire or captured.
Elsewhere in the story, the same character seems to be called Egesarius.
De Ortu Waluuanii Nepotis Arturi | Late 13th century