According to Klingon tradition, Molor was a hated tyrant who ruled Qo'noS approximately 1500 years ago. He was killed by Kahless the Unforgettable, who went on to found the Klingon Empire and become the greatest warrior in Klingon history. (TNG: "Rightful Heir")
Molor's death is celebrated yearly with the observance of the Kot'baval Festival. (TNG: "Firstborn")
Molors head is preserved in a mummified state on planet Karanga IV and is displayed to the public for a fee of 50 Darsek.