== 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.
== 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.
Source: Wikipedia "Duchess of Courland" · CC BY-SA 4.0
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