He married Sofie, Countess of Sommerschenburg Abt 1182 . Sofie, Countess of Sommerschenburg was born at of Sommerschenburg, Sachsen, Prussia Abt 1147 daughter of Friedrich, Count Palatine of Sommerschenburg and .
They were the parents of 5
children:
Jutte, Princess of Thuringia
born Abt 1183.
Hedwig, Princess of Thuringia
born 1184.
Irmgard Princess of Thuringia
born Abt 1186.
Ludwig IV "der Heilige" Landgrave of Thuringia
born 28 Oct 1200.
Agnes, Princess of Thuringia
born Abt 1206.
Sofie, Countess of Sommerschenburg died 1195 .