Ludwig von Sigmaringen was married to Richinza von Spitzenberg, daughter of Berthold I. von Zähringen. At the end of the 11th century he built a castle on the "Spitzenberg" at Kuchen, Germany. The castle and the surrounding land and villages were part of the inheritance of Richinza. From their marriage Richinza and Ludwig had four children; Mathilde von Spitzenberg, the wife of Aribo von Wertingen, the clergyman Ulrich von Sigmaringen, Ludwig II von Sigmaringen-Spitzenberg and Manegold von Sigmaringen-Spitzenberg. The three brothers, Ulrich, Ludwig and Mangold von Sigmaringen are named as the founders of the 11th-century St. George's Abbey in the Black Forest.