Sir Tristan/Tristram and Sir Lancelot (right), seen jousting here might have been mythical members of the Camelot community, but their official heraldic arms have been legitimately on the books.
Knights, rather like the later and typically more proletarian Pirates, were a well-defined roughneck subculture within western society that in theory lived according to high, almost utopian ideals, but in practice generally didn't.
Tristan,son of King Meliodas, was always my favourite Arthurian hanger-on, clearly less intrinsically dickish than Lancelot, Gawain and oh-so-bloody perfect Percival.
In Malory I always looked forward to his periodic encounters with Palomides, the box ticking Middle Eastern infidel at the Round Table, notorious for his unrequited hankering after Iseult. (One felt for him as no magical love potion was required to make him keen for the bean.)