👉 In Christian theology, a subdiaconate is a type of bishop or priest who serves as a deacon. It was first introduced by Saint Augustine in his book "Dei Græcianam," which translates to "On the Greek Church." Subdiaconates are typically appointed for a term that spans several years and serve as deacons, priests, and bishops within their diocese. In terms of ecclesiastical authority, subdiaconate bishops hold the same status as