A vacant spot among this group, Siege Perilous, is filled by a youthful bastard child who begins the Grail Quest.
One member of this group avenges the death of his father and returns wearing his father's armor, hence his nickname meaning "badly-fitting coat." Another member of this group makes a lion into his pet by saving it from a snake. This group was first mentioned in the Roman de Brut penned by Wace. Prior to becoming a member of this group, a lowly kitchen boy received the nickname "Good Hands," or "Beaumains." A vacant spot among this group, Siege Perilous, is filled by a youthful bastard child who begins the Grail Quest. For 10 points, name this group, all of whose members supposedly had equal status, that hung out at King Arthur's Court.
One member of this group avenges the death of his father and returns wearing his father's armor, hence his nickname meaning "badly-fitting coat."
Knights of the Round Table [prompt on answers like King Arthur's Court or King Arthur's knights before the very end]