Ursula Katharina of Altenbockum, divorced Princess Lubomirska, married Duchess von Württemberg-Winnental [1] (Polish: Urszula Katarzyna Lubomirska z domu Bokum;[2] 25 November 1680 – 4 May 1743), later Imperial Princess of Teschen (German: Reichsfürstin von Teschen), was a Polish-German noblewoman and mistress of Augustus II the Strong, King of Poland and Elector of Saxony, in 1700-1705.

He was the youngest son of Grand Marshal and Hetman Prince Jerzy Sebastian Lubomirski and his wife, Barbara Tarło.

Around the end of the century, August the Strong, Elector of Saxony and since 1697 King of Poland, had met the vivacious and beautiful Princess Lubomirska, and after the dissolution of her marriage, he used Ursula's relations with the Cardinal-Primate to meet her.

On 21 August 1704 she gave birth a son, Johann Georg, later the Chevalier de Saxe, who was named for the king-elector's father.

Years later, after the King had banished the Countess of Cosel, Ursula returned to Dresden, where she occupied a respected position in the Hof.

Her rule over Hoyerswerda ended in 1737; for compensation, the new Saxon elector and king, August III, gave her an annuity of 18,000 Reichstalern until her death and 6,000 for her son, the Chevalier de Saxe.