Which four knights sat at King Arthur's round table?

There were actually 150 knights that sat at his table. Some of them are Pellinore, Tristan, Percival, Bors, Gawain, Lancelot, Galahad, Ector, Lionel, Gaheris, Agravane, Gareth, Rheynold, Kay, Matthias and Lamorack. That is just a portion of the knights.