Denier Bracteate - Leszek of Masovia Płock mint

Leszek was the son of Bolesław IV Curly and ruled Masovia as a separate duchy during the period of Polish fragmentation that followed the Testament of Bolesław III Wrymouth in 1138. That document, intended to prevent dynastic conflict, instead fractured the Piast realm into competing principalities for nearly two centuries. The Płock mint was among the oldest functioning mints in Mazovia, the town having served as a seat of Polish rulers well before the fragmentation period.

Bracteates of this type were struck on thin, broad flans from a single die — a technique common in Central European minting from the mid-twelfth century onward. Kopicki 217 is among the rarer attributions within the Masovian series.