Frolle of the Out Isles
A knight who was rescued by Lamorat from four knights who had attacked him all at once. Frolle left in a huff when Lamorat refused to reveal his name.
Gawaine abducted Frolle’s lady and was defeated in combat by Frolle. Lamorat, witnessing Gawaine’s defeat, engaged Frolle to protect the honor of the Round Table. Frolle was killed in the duel.
His brother Bellyas the Proud (Belliance le Orgulus) tried to avenge his death and failed.
See also
Out Isles | The Legend of King Arthur
Source
Le Morte Darthur | Sir Thomas Malory, 1469-1470