He renewed this treaty after becoming count in 1325, when Württemberg had temporarily joined sides with Louis IV.

Both Louis and Frederick claimed power in the Holy Roman Empire at this time.

After their reconciliation it was possible for Ulrich to be bound closely to the Holy Roman Empire, even after the death of Frederick I.

This and his regional policy of pacts and acquisitions helped strongly to enlarge Württemberg's territory substantially.

Sons from this marriage were Eberhard II and Ulrich IV, who ruled together with his brother until 1361.