20 Nummi - Heraclius Constantinopolis

Heraclius seized power in 610 by sailing from Carthage to Constantinople with a fleet reportedly decorated with icons, deposing the murderous usurper Phocas almost immediately upon arrival. His thirty-year reign became one of the most militarily extreme in Byzantine history — near-total collapse against the Sassanid Persians in the 610s and 620s, followed by a stunning reversal that recovered Jerusalem and the True Cross, only for the Arab conquests to strip those gains within a decade of his death.

The Constantinople mint during his reign underwent significant administrative reorganization, and dating by regnal year was introduced on folles and their fractions — a practice that makes precise attribution of this fractional issue possible within broad ranges rather than single years.