AMBROSIUS AURELIANUS, leader of the Britons against the
Saxons in the 5th century, was, according to the legends
preserved in Gildas and the Historia Brittonum, of Roman
extraction. There are signs of the existence of two parties in
the national opposition to the invaders, but as Pascent, son of
Vortigern, is said by Nennius to have held his dominions in the
west by leave of Ambrosius, the Roman element seems to have
triumphed. Some measure of success appears to have attended the
efforts of Ambrosius, and it has been suggested that Amesbury in
Wiltshire is connected with Emrys, the Celtic form of his name.
See Bede, Eccl. Hist. (Plummer), i. 16; Nennius, Hist.
Britt. sec. 31; Gildas, De excidio Brittarum, sec. 25;
J. Rhys, Celtic Britain (1884), pp. 104, 105, 107.
Initial text from 1911 encyclopedia -- Please update as needed