Maurice appears in the episode, Dunces and Dragons. He and his wife are the judges of the anual Jousting Tournoment. He appears helping Spongebob and Patrick up after they had a great fall. He wears a purple king's outfit with a crown, for jousting. It could be possible that he is a king, or has some blood lines with royalty.
Quotes
"ZzZzZzZ, WHAAA WHATT??"
"IT APPEARS THAT THE PINK STARFISH, AND THE YELLOW SPONGE, ARE OUR LUCKY CONTESTANTS"
"AAHHHH, OK"