Sir Kay
Cath Palug was fought and slain by Cai (Sir Kay), or so it is implied, in the incomplete poem "Pa Gur yv y Porthaur" ("What man is the porter"), found in the Llyfr Du Caerfyrddin (The Black Book of Carmarthen, written before 1250). Kay had gone to destroy "lleown" (possibly meaning "lions") in Môn (Anglesey). In the encounter, nine score (180) warriors were killed by the cat.