Admiral Kassius Konstantine is a supporting antagonist in Star Wars Rebels.
He was an admiral of the Imperial Navy and and was dispatched to the Lothal system after a rebel movement had began to spring up in the system in an attempt to maintain Imperial authority over the planet and keep the Galactic Empire in power. Konstantine would become one of the Imperials chasing the Lothal rebels across the galaxy under the command Agent Kallus and the Fifth Brother of the Inquisitorius, but the rebels kept escaping Konstantine and his men every time.
Konstantine's failures eventually lead him to being placed under the command of Governor Arihnda Pryce and Grand Admiral Thrawn, a seasoned tactician and commander of the Seventh Fleet. Konstantine ended up becoming Thrawn's subordinate and was sent on various missions on behalf of his Chiss superior, which made him envious and motivated him to outdo him at any turn.