Duchess of Courland House of Kettler, 1561–1737 House of Biron, 1737–1740 Council of the Duke, 1740–58 House of Wettin, 1758–1763 None, although Charles of Saxony was morganatically married with the Polish countess Franciszka Korwin-Krasińska. House of Biron, 1763–1795 Courland Latvia history-related lists