Aureus - Diocletian CONSVL IIII P P PROCOS, Cyzicus

Diocletian held his fourth consulship in 290 AD, the year this issue commemorates — a politically charged moment when he and Maximian were engineering the ideological framework that would become the Tetrarchy. Cyzicus, a strategically vital mint on the Propontis, was reactivated under Diocletian precisely to supply the eastern campaigns and administrative machinery he was rebuilding from the ground up.

RIC V.2 #286 is among the scarcer Cyzican gold issues of the reign. The PROCOS legend — proconsular title — used alongside the consular count reflects Diocletian's careful accumulation of constitutional titles rather than outright autocratic language.