"Frederick William (German: Friedrich Wilhelm; 19 July 1692 – 21 January 1711) was Duke of Courland and Semigallia from 1698 to 1711. Frederick Wilhelm was the ...
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son of Friedrich Kasimir Kettler, Duke of Courland and Semigallia and Princess Elisabeth Sophie of Brandenburg. During his reign the duchy was occupied by Swedish and later by Russian troops." - (en.wikipedia.org 12.08.2021)
