Mortlach

is a Holy Knight serving King Arthur Pendragon of Camelot. He is also the brother-in-law of Ironside and the uncle of Diodra.

Sistana arc
Mortlach appears in the middle of the battle between Ironside and Percival's group. Mortlach stops Ironside from continuing the fight, Ironside demands that he not interfere, but Mortlach reminds him that whoever destroyed the monsters he summoned must be someone as strong as the Seven Deadly Sins, so in the face of such a threat, it is best for them to retreat. After collecting the pieces of the Coffin of Eternal Darkness minus the Dragon Handle that Donny kept, both Holy Knights leave.

Wallnack arc
Mortlach was training Diodra with swords, surprised by his nephew's progress and asking him if he was training alone in secret. Diodra asks him not to tell her father so as not to worry him, to which Mortlach says that Ironside will end up scolding him. Diodra then asks him to continue telling his story, and Mortlach tells him about when he and his sister were punished by his father for sneaking out drinking and gambling, warning the boy not to do the same. Diodra asks him why his father keeps telling him lies that Britannia is nothing more than a world full of dangers, further fueling his curiosity. Mortlach tells him that he understands what he feels, but that her brother-in-law does not lie and that he is sure that he loves him from the bottom of his heart.

When a bird arrives to inform Mortlach of a mission from king Arthur, he leaves, leaving Diodra in charge of Turret and Rothes.

Trivia

 * Like many of the Camelot Holy Knights, Mortlach is named after the, a distiller of Scotch whisky in Dufftown, Moray, Scotland, founded in 1823.