Sporacius or Asporacius was present at Chalcedon in 451, as comes domesticorum, or one of the two commanders of the body guard. It was at his request that Theodoret wrote his Hæreticarum fabularum compendium which he dedicates “To the most magnificent and glorious lord Sporacius my Christ-loving son.” To Sporacius was also addressed the short treatise “adversus Nestorium” of which some editors have doubted the genuineness. The present letter may be dated in 449.