Constantine II, 22 May 337 - March or April 340 A.D.
Constantine II was the son of Constantine I, the eldest with his second wife, Fausta. He was born in Arles (which was renamed Constantia in his honor in 328, explaining the CON mintmarks for Arles) and was made Caesar before he was a year old in 316 A.D. Upon his father's death, Constantine II inherited the Western part of the empire. After quarrelling with his brother Constans, he invaded his territory, only to be killed in an ambush near Aquileia. His coins often include "IVN" in the legend, an abbreviation for junior.