Born into the affluent Ragnvindr Clan, Diluc inherited the Dawn Winery after the untimely death of his own father, Crepus. Diluc was originally a member of the Knights of Favonius that protected the nation Mondstadt, although after his father's demise Diluc became disillusioned with the organization and began operating as a covert vigilante known as the "Darknight Hero." He is also the sworn brother of Kaeya Alberich.