Ambrosius Aurelianus
The earliest mention of the Battle of Badon is Gildas' "De Excidio et Conquestu Britanniae" ("On the Ruin and Conquest of Britain"), written in the early to mid-6th century. In it, the Anglo-Saxons are said to have "dipped [their] red and savage tongue in the western ocean" before Ambrosius Aurelianus organized a British resistance with the survivors of the initial Saxon onslaught. Gildas describes the period that followed Ambrosius' initial success: