Fürst & Duke zu Friedland, Duke of Mecklenburg
It was a stroke of good fortune for Albrecht von Wallenstein when in 1623 he married Maria Elisabeth, fourth daughter of Karl Harrach. Through this marriage all doors at court were open to him. From a relatively impoverished Bohemian nobleman he became a feudal lord of 300 vassals, owning one-quarter of Bohemia,
His daughter Maximiliana married Count Adam Erdmann Trczka, who was murdered with Wallenstein on 25 February 1634.