Frederick married Elizabeth Henrietta of Hesse-Cassel on 23 Aug 1679 in Potsdam, Brandenburg, Germany. Elizabeth was born on 8 Nov 1661 in Cassel; died on 27 Jun 1683 in Coln au Der, Spree. [Group Sheet] [Family Chart]

1. King of Sweden Frederick, I
2. Louise was born in 1680; died in 1705.

Frederick married Queen of Prussia Sofie Charlotte on 08 Oct 1684 in Herrenhausen, Ammerland, Niedersachsen, Germany. Sofie (daughter of Duke of Brunswick Ernest Augustus and Countess Palatine of Simmem Sophia Hanover) was born on 20 Oct 1668 in Schloss Iburg, Near, Osnabruck, Germany; died on 1 Feb 1705 in Hannover, Hannover, Niedersachsen, Germany; was buried in Dom, Berlin, Brandenburg, Prussia. [Group Sheet] [Family Chart]

1. _____ Prussia
2. Frederick Augustus was born in 1685; died in 1686.
3. _____ Prussia was born about 1685 in Herrenhausen, Ammerland, Niedersachsen, Germany.
4. Frederick Augustus Of Prussia was born in 1685 in Berlin, Germany; died in 1686.
5. _____ Germany was born about 1687 in Herrenhausen, Ammerland, Niedersachsen, Germany; died about 1687.
6. King of Prussia Frederick William, I was born on 14 Aug 1688 in Berlin, Germany; died on 31 May 1740 in Potsdam, Brandenburg, Germany; was buried in Potsdam, Brandenburg, Germany.

Frederick married Sophia Louise Mecklenburg on 28 Nov 1708 in Berlin, Germany. Sophia was born on 16 May 1685; died on 29 Jul 1735 in Grabow. [Group Sheet] [Family Chart]