heiress of the House of Babenberg through her mother Gertrude of Austria. In 1308, Ulrich took the side of Albert of Habsburg and his sons Rudolph and Frederick in their feud against Henry of Gorizia-Tyrol over the inheritance of the Bohemian throne. By handing over his lands to the Habsburgs and receiving them back from them as a fief, Ulrich became a Habsburg vassal, significantly weakening Henry's position in the strategically important region between Styria and Carniola. In the peace treaty of 1308, confirmed in 1311, the Savinja Valley was finally incorporated into Habsburg Styria. Ulrich died around 1316. His son Frederick would successfully claim his mother's inheritance in southeastern Carinthia and in Savinja, including the Celje Castle, thus doubling his possessions and paving the way for the rise of the House of Celje. References 1250s births 1316 deaths Year of birth uncertain Counts of Celje