Ernst married Princess Dorothea Charlotte Brandenburg on 01 Dec 1687 in Darmstadt, Starkenburg, Hesse-Darmstadt. Dorothea (daughter of Albrecht Margrave of Brandenburg-Ansbach and Countess of Oettingen Sofie Margarethe) was born on 18 Nov 1661 in Ansbach, Mittelfranken, Bavaria; was christened on 19 Nov 1661 in Ansbach, Mittelfranken, Bavaria; died on 15 Nov 1705 in Darmstadt, Starkenburg, Hesse-Darmstadt, Germany; was buried on 24 Nov 1705 in Stadtkirche, Darmstadt, Starkenburg, Hesse-Darmstadt. [Group Sheet] [Family Chart]

1. Princess of Hesse-Darmstadt Dorothea Sofie was born on 14 Jan 1689 in Giessen, Oberhessen, Hesse-Darmstadt; was christened on 14 Jan 1689 in Giessen, Oberhessen, Hesse-Darmstadt; died on 7 Jun 1723 in Hohringen, Jagstkreis, Whurttemberg; was buried in Hohringen, Jagstkreis, Whurttemberg.
2. Landgrave of Hesse-Darmstadt Ludwig, VIII was born on 05 Apr 1691 in Darmstadt, Starkenburg, Hesse-Darmstadt; was christened on 05 Apr 1691 in Darmstadt, Starkenburg, Hesse-Darmstadt; died on 17 Oct 1768 in Darmstadt, Starkenburg, Hesse-Darmstadt; was buried on 20 Oct 1768 in Stadtkirche, Darmstadt, Starkenburg, Hesse-Darmstadt.
3. Prince of Hesse-Darmstadt Karl Wilhelm was born on 17 Jun 1693 in Nidda, Oberhessen, Hesse-Darmstadt; was christened on 17 Jun 1693 in Nidda, Oberhessen, Hesse-Darmstadt; died on 17 May 1707.
4. Prince of Hesse-Darmstadt Franz Ernst was born on 25 Jan 1695 in Giessen, Oberhessen, Hesse-Darmstadt; was christened on 25 Jan 1695 in Giessen, Oberhessen, Hesse-Darmstadt; died on 8 Jan 1716.
5. Princess Hesse-Darmstadt Charlotte Friederike was born on 8 Sep 1698 in Darmstadt, Starkenburg, Hesse-Darmstadt; was christened on 8 Sep 1698 in Darmstadt, Starkenburg, Hesse-Darmstadt; died on 22 Mar 1777 in Darmstadt, Starkenburg, Hesse-Darmstadt; was buried in Stadtkirche, Darmstadt, Starkenburg, Hesse-Darmstadt.