House of Kettler zu Assen
Cadet branch of the House of Kettler
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House of Kettler zu Assen
Lords of Assen and Hovestadt -
House of Kettler zu Assen
Dukes of Courland and Semigallia
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Gotthard Kettler
1559–1561
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Gotthard Kettler
1561–1587 -
Wilhelm Kettler
1587–1616
Ruled western Courland -
Friedrich Kettler
1587–1642
Ruled eastern Courland -
Jacob Kettler
1642–1682 -
Friedrich Casimir Kettler
1682–1698 -
Friedrich Wilhelm Kettler
1698–1711 -
Ferdinand Kettler
1711–1737