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Duchess Sophie of Prussia can make readers thint she was duchess of Prussia, which she was not: she was from Prussia, and Duchess of Courland. Why not Sophie of Prussia (1582-1610) instead? 2.14.76.223 (talk) 16:17, 15 December 2011 (UTC)
We can read: Sophie and Albert Frederick had one son: Jacob Kettler, who succeeded his father as Duke of Courland. The problem is: Albert Frederick was her father, not her husband. Bianchi-Bihan (talk) 01:44, 31 December 2011 (UTC)[reply]