1 Solidus - Friedrich and Wilhelm Kettler Mitau, type 1

Courland's solidus coinage of this period reflects the joint rule that followed Gotthard Kettler's death in 1587, when his sons Friedrich and Wilhelm inherited the duchy under an arrangement that left both nominally in charge — a dynastic awkwardness that persisted until Wilhelm's eventual expulsion by the Polish-Lithuanian Sejm in 1616. Billon issues from small Baltic duchies of this decade circulated primarily as petty change within the local economy, and Mitau's output was modest enough that surviving examples in decent condition are genuinely scarce.