Denier - Béla IV

Béla IV's long reign was defined almost entirely by the Mongol invasion of 1241–42, which devastated Hungary's population and obliterated much of its administrative infrastructure — including the minting apparatus. Coinage from the pre-invasion years and the rebuilding decades after looks remarkably similar, making precise dating within the reign nearly impossible without die study.

The kingdom's slow monetary recovery after the invasion meant output was irregular for years.