Caius d'al Cazarosta was the firstborn son of Calvin d'al Cazarosta, 4th Earl of Leoniscourt in OIE 585. His status as a deathborn meant that with his birth, his mother was immediately attainted and executed and that he himself would be unable to legitimately succeed his father.
Cazarosta is a excellent soldier and commands absolute loyalty from his men, despite being quite frigid and blunt. He also shows many symptoms of sociopathy, showing little emotion and having a capacity for extreme cruelty, only if it serves a military purpose however. also, unlike most sociopaths, he exhibits no jealousy towards others and he despises cruelty for cruelty's sake.
Cazarosta became a Lieutenant due to an incident (which is, so far, not revealed yet) which also awarded him the Gryphon of Rendower.
During the Battle of Blogia Cazarosta was heavily wounded during the defense of Castle Blogia. His left eye was completely destroyed by a hussar's baneruned sword and despite banehealers regrowing the eye the area surrounding it was left permanently blackened and cracked. Following the Battle, Cazarosta was promoted to Captain and awarded a knighthood by the king himself, making him possibly the only Deathborn knight in Tierran history.