The fattest knight at King Arthur's round table was Sir Cumeference. He acquired his size from too much pi.
Who’s the roundest knight at King Arthur’s round table?
Circumference.
Who was the knight on the Round Table that only ate meat?
Sir Loin.
What was the knight's name that sat at the round table?
Circumference.
Which one of Lord Arthur's knights invented the round table?
Sir Cumference.