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Jacob Kettler
Jacob Kettler (German: Jakob von Kettler), Duke of Courland (Goldingen, now Kuldiga, Latvia, 28 October 1610 – 1 January 1682, Mitau, now Jelgava, Latvia) ruled the Duchy of Courland from 1641 to 1682. Under his rule, the duchy was brought to its greatest peak in wealth.
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