He was the younger son of Magnus Maximus and he adopted the name Flavius Claudius Constantinus, Constantine II, King of the Britons. As a Romano-British general in a country in chaos he was declared by his troops as Western Roman Emperor in 407. He crossed the channel like others before him, taking the last of the ancient legions, and he established himself in Gaul. Honorius recognized him as co-emperor for a while, even made him joint consul, and so to the Romans he became known as Constantine III. His praetorian praefect carried the fateful name of Decimus. And King Constantine was duly murdered through treachery.
Constantine’s older son, Constans, was persuaded by Vortigern to become King of the Britons. His younger son was Ambrosius himself.
“The Man Who Lost Britain”
Constantine III AV Solidus. Lugdunum, AD 408-409. D N CONSTANTINVS P F AVG, pearl-diademed, draped and cuirassed bust right / VICTORIAA AVGGG (sic), Emperor standing right, holding labarum and Victory on globe, treading on captive to right; L-D across fields, CONOB in exergue. RIC 1512; C. 5 var.; Bastien Lyon pl. 28, 250n (same dies); LRC 793; Depeyrot 22/2. 4.43g, 21mm, 12h.
Fleur De Coin. Very Rare; an exceptional example of the type.
From the Roma Numismatics Auction XIII
Lot 998: Constantine III AV Solidus.
Hammer Price: £20,000.00
Image and auction text thank you Roma Numismatics