King Looie Kats is the great-great-great-grandfather of the Cat in the Hat and the great-great-great-great grandfather of the Young Cat in the Hat and sister.
Dr. Seuss wrote of King Looie Katz as a proud king of the kingdom of Katzen-stein. King Looie was especially proud of his royal tail and did not want it to drag on the ground and get dirty. So he commanded Phooie Katz to walk behind him and carry his tail and then later all the cats were walking behind him with their tails being held except the last cat in line who then has enough and slams a tail of a cat down which all the cats do the same thing. So King Looie and the other cats walk around with holding their own tails.