King Krabs was a medieval monarch of Bikini Bottomshire sometime before the 12th century and the medieval ancestor of Mr. Krabs. He first appears in the episode "Dunces and Dragons" in which he's the king of Bikini Bottomshire.
He looks the same as Mr. Krabs. He wears a light blue shirt and purple-blue shorts, a cloak and a crown. In Bikini Bottom Brawlers, he wears gold colored gloves for his claws.