Ambrosius Aurelianus
Ambrosius Aurelianus is one of the few people that Gildas identifies by name in his sermon "De Excidio et Conquestu Britanniae", and the only one named from the 5th century. "De Excidio" is considered the oldest extant British document about the so-called Arthurian period of Sub-Roman Britain. Following the destructive assault of the Saxons, the survivors gather together under the leadership of Ambrosius, who is described as: