Crispus 

Flavius Julius Crispus, Caesar 317 - 326

Son of Constantine I , Crispus was made Caesar in 317, along with his half-brother Constantine II and Licinius II. Crispus was a fine and popular soldier, winning many victories for the empire. Crispus was Constantine's son by his first wife Helena, and as such presented an obstacle to the dynastic ambitions of Constantine's second wife, Fausta, mother of Constantine II, Constantius II and Constans. She brought evidence (almost certainly fabricated) of Crispus' treason before Constantine, who had his son imprisoned and executed in 326. When Constantine learned of Fausta's treachery, this first Christian emperor had her thrown into a vat of boiling water.

AE3

Obv: Laureate bust of  Crispus, right. 
IVL CRISPVS NOB C

Rev : VOT V within a  wreath.
CAESARUM NOSTRORVM

VOT V  refers to prayers  of thanks given for five years of Crispus' reign. Despite it seeming so,  this is not a good indicator of the coin's year of minting.

 AD 317 - 326