Friedrich Wilhelm I.

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Friedrich Wilhelm I is the name of the following people:

Friedrich Wilhelm I (Mecklenburg) , Duke (1692–1713)
Friedrich Wilhelm I. Adolf (Nassau-Siegen) , Prince (1707–1722)
Friedrich Wilhelm I (Prussia) , the soldier king, king (1713–1740)
Friedrich Wilhelm I (Saxe-Weimar) , Duke (1573–1602)
Friedrich Wilhelm I (Hessen-Kassel) , Landgrave and Elector (1847–1866)

See also:

List of rulers named Friedrich