Flavius Julius Crispus, also known as Flavius Claudius Crispus and Flavius Valerius Crispus was a Caesar of the Roman Empire. He was the first-born son of Constantine I and Minervina. Constantine apparently believed in the abilities of his son and appointed Crispus as Commander of Gaul. Crispus was leader in victorious military operations against the Franks and the Alamanni in 318, 320 and 323. Thus he secured the continued Roman presence in the areas of Gaul and Germania. Crispus spent the following years assisting Constantine in the war against by then hostile Licinius. In 324, Constantine appointed Crispus as the commander of his fleet which left the port of Piraeus to confront the rival fleet of Licinius. The subsequent Battle of Hellespont was fought in at the straits of Bosporus. The 200 ships under the command of Crispus managed to utterly beat the enemy forces which were at least double in number. Thus Crispus achieved his most important and difficult victory which further established his reputation as a brilliant soldier and general. Following his navy activities, Crispus was assigned part of the legions loyal to his father. The other part was commanded by Constantine himself. Crispus led the legions assigned to him in another victorious battle outside Chrysopolis against the armies of Licinius. The two victories were his contribution to the final triumph of his father over Licinius. Constantine was the only Augustus left in the Empire. He honoured his son for his support and success by depicting his face in imperial coins, statues, mosaics, cameos, etc. Eusebius of Caesaria wrote for Crispus that he is "an Imperator most dear to God and in all regards comparable to his father." Crispus was the most likely choice for an heir to the throne at the time. His siblings Constantine II, Constantius II and Constans were far too young and inexperienced. In 326, Crispus life came to a sudden end: On his father's orders he was tried by a local court at Pola, Istria, condemned to death and executed.

Main Roman Coin Book and Other References:

RIC = Mattingly, Harold    The Roman Imperial Coinage
BMC = Coins of the Roman Empire in the British Museum
RSC = Seaby, H A    Roman Silver Coinage
RCV = Sear, David R    Roman Coins and Their Values
Cr = Crawford, Michael    The Roman Republican Coinage
SB = Sear, David R    Byzantine Coins and Their Values
S = Coins of England and the United Kingdom
WW = Wildwinds.com (reference & attribution site)