Geoffrey of Monmouth described how this guy, a sewer, perished in  Arthur's battle against Lucius Tiberius, but he was useful in assisting  Arthur to defeat the giant dwelling at Mont Saint-Michel.
Geoffrey of Monmouth described how this guy, a sewer, perished in  Arthur's battle against Lucius Tiberius, but he was useful in assisting  Arthur to defeat the giant dwelling at Mont Saint-Michel. This man  nicknames a certain figure "La Cote Male Taile" and has that man,  Breunor le Noire fight the buffoon Dagonet. Earlier, he nicknamed Sir  Gareth Beaumains. According to one of the Welsh Triads, he is one of the  "Three Enchanter Knights of Britain," and he can change his height and  weight to any value, not to mention he was gifted with the ability to  breathe (*) underwater for nine days. Thomas Mallory introduces us to him  by having this son of Sir Ector order a servant home to retrieve a sword at a  joust, only for a sword to be pulled from a stone. For 10 points, name foster  brother of King Arthur.
Geoffrey of Monmouth described how this guy, a sewer, perished in  Arthur's battle against Lucius Tiberius, but he was useful in assisting  Arthur to defeat the giant dwelling at Mont Saint-Michel.
Sir Kay [or Sir Cai, Sir Kai, Sir Cay, Sir Cei, Sir Kei, Sir Caius, accept Sir Bedver the Butler on the first sentence]