Patrick Revere was one of Patrick's famous ancestors and his great great great uncle who was featured in Pest of the West.
Revere's role in Bikini Bottom history was to warn people when the man-eating mollusks were coming. Nobody believed him about the mollusks though, thinking he was just a lunatic, until they actually saw them and ran away.
Revere was a large, overweight sea star, much like the rest of his family. He had long, braided brown hair, which was partially covered by his hat, which matched his blue and red military uniform.
Patrick is a parody of Paul Revere who warned Lexington of the Redcoats but failed to warn Concord.
According to Patrick Star, his ancestor's supposed fame is why he doesn't care about life accomplishments as Revere already did it for him.