Ulrich I, count of Württemberg

Ulrich's relation to his predecessors is uncertain. The historian Hansmartin Decker Hauff calls Ulrich the son of Hermann of Württemberg and Irmengard of Ulten. Hermann, who is mentioned only once, in 1231, is probably a son of Hartmann, Count of Württemberg. He was a cousin of Count Hartmann II of Grüningen and a relative on his father's side of the count Albert IV. Ulrich was twice married. From his first marriage, to Mechthild of Baden, daughter of Hermann V he had two daughters and a son, who would succeed him as Count Ulrich II. From his second marriage to Agnes of Schlesien Liegnitz he had another son, Eberhard I and possibly another daughter.

http://en.wikipedia.org/wiki/Ulrich_I,_Count_of_W%C3%BCrttemberg