Solidus - Crispus PRINCIPI IVVENTVTIS, Sirmium

Crispus, Constantine's eldest son and a capable general who had just defeated the Lician fleet at the Hellespont in 324, was elevated to Caesar in 317 and issued coins of this type from Sirmium during a period when the city served as a key imperial administrative center on the Danube frontier. The PRINCIPI IVVENTVTIS title — Prince of Youth — was a traditional honorific granted to heirs and junior emperors, here deployed as much for dynastic propaganda as for any constitutional meaning.

Crispus was executed by his own father in 326, making his entire coinage series artificially truncated. Sirmium output for this type is scarce relative to Trier or Thessalonica.