1 Fürstengroschen - Ernest I, Botho and Caspar Ulrich

The County of Regenstein was one of the more obscure lordships of the Harz region, its territory squeezed between the expanding ambitions of Brunswick-Wolfenbüttel and the Bishopric of Halberstadt. By 1565, the county was already in its terminal decline — Regenstein would be absorbed by Brandenburg-Prussia within decades. The joint issue under Ernest I, Botho, and Caspar Ulrich reflects the partitioned co-rulership arrangements common among German dynastic houses of the period, where inheritance fragmentation often produced coins with multiple regnal names that survive in very small numbers today.