Hezul is one of the Twelve Crusaders, possesses the title of Black Knight, is the original wielder of the Mystletainn, and is the founder of Agustria. His youngest daughter had major holy blood and was married off to the Nordion house. His direct descendants who formed the royal family, have minor holy blood and gave Mystletainn to House Nordion in return for their eternal loyalty.
Hezul is a possible reference to Hod, the blind god of Norse mythology. He accidently killed his brother with the Mystletainn (mistletoe).