El doble misterio del denario de Cayo y Lucio Césares

These denarii of Augustus, which bear Gaius and Lucius Caesars, his grandsons, adopted sons, and heirs, on their reverse, are surely the most common silver coins from this emperor's reign, and well known to all collectors of Roman imperial coins. However, few know that they conceal two mysteries, the second of which is a mysterious and obscure prince, a controversial and contentious figure who may also have appeared on the reverse of these silver coins.