King Richard is Prince John's brother. He was the kind hearted monarch of Nottingham.
In The Grand Adventure - He went on a crusade. But He was only seen next to Friar Tuck at Mewsette and Jaune Tom's wedding in the end of the film.
In The Grand Adventure 2 - Richard was "killed" (offscreen) by Harasta and Gaston who sent The Sheriff of Nottingham to take over Nottingham.