The paladins of Charlemagne were all scattered by the battle of Roncesvallës. The champions of Diderick were all assassinated at the instigation of Chriemhilda, the bride of Ezzel, King of the Huns.
The Knights of the Round Table were all extirpated by the fatal battle of Camlan.
(1) There was no braver or more noble king than Arthur.
(2) No fairer or more faithless wife than Guiniver.
(3) No truer pair of lovers than Tristan and Iseult (or Tristram and Ysolde).
(4) No knight more faithful than Sir Kaye.
(5) None so brave and amorous as Sir Launcelot.
(6) None so virtuous as Sir Galahad.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894