Honoratus Antoninus was bishop of Cirta/Constantina in Numidia (nowadays Constantine in Algeria) in the reign of the Vandal king Geiseric (r. 428–477 CE). He was committed to the Catholic resistance against the royal policy of repression in favor of Arianism. He is known for his only preserved letter (plausibly datable to c. 437 CE), in which he urges a certain Arcadius to hold to the Catholic belief in the Trinity, even at the risk of martyrdom.

There are two problems with identification – part of the general difficulty …