Background
He was the fourth (but third surviving) son of Maurice, Duke of Saxe-Zeitz, and his second wife, Dorothea Maria of Saxe-Weimar.
He was the fourth (but third surviving) son of Maurice, Duke of Saxe-Zeitz, and his second wife, Dorothea Maria of Saxe-Weimar.
In Öls on 23 April 1699, Frederick Henry married Sophie Angelika of Württemberg-Oels. From then on, he assumed the title duke of Saxe-Zeitz-Pegau-Neustadt (Herzog von Sachsen-Zeitz-Pegau-Neustadt). In Moritzburg on 27 February 1702, Frederick married for a second time to Anna Fredericka Philippine of Schleswig-Holstein-Sonderburg-Wiesenburg.
They had two children:
Maurice Adolph Charles (b Moritzburg, 1 December 1702 - d Pöltenberg, 20 June 1759), Duke of Saxe-Zeitz-Pegau-Neustadt (1713-1718), Bishop of Hradec Králové (Königrgrätz) (1732) and Litoměřice (Leitmeritz) (1733-1752),
Dorothea Charlotte (b Moritzburg, 20 May 1708 - d Moritzburg, 8 November 1708).
However, soon afterwards (1718) the young Maurice Adolf himself became a priest and renounced his claims to the duchy, which made the extinction of the Saxe-Zeitz line inevitable. Without other male heirs, Zeitz was finally merged into the Electorate of Saxony after the death of Maurice Wilhelm.