24 Mariengroschen - John Frederick

John Frederick ruled Calenberg from 1665 until his death in 1679, and his tenure coincided with aggressive monetary reform across the fragmented north German states following the chaos of the Thirty Years' War. The 24 Mariengroschen denomination was a specifically Lower Saxon convention — essentially a thaler subdivision designed to rationalize exchange between the proliferating coinages of the region's competing principalities. Brunswick-Lüneburg itself remained politically divided among Welf lines until John Frederick died without legitimate heirs, after which Calenberg passed to his brother Ernest Augustus, who ultimately secured the Electoral dignity in 1692.