Silesia was the glorification of the died out Silesian Piasts and its successors, the Habsburgs. The mother of the last ruling duke of the Silesian Piasts, princess Louise of Anhalt-Dessau, built a Piast mausoleum in Liegnitz commemorating the extinct dynasty, which shows a unique program by poet Daniel Casper von Lohenstein. The Cistercians regarded themselves as keepers of the Piastic legacy and erected commemorating programs in Leubus and Grüssau (Lubiąż and Krzeszów Abbeys), but also rendered homage to the Habsburgs at the university of Breslau, in Leubus and in Lobris (Luboradz). The early period of the baroque era (1640–80) was marked by the activity of Italian masters, which after the Thirty Years' War filled the gaps in the entire Holy Roman Empire. St. Matthias in Breslau (1654) and Cistercian churches like Grüssau (1670) were first altered, later it affected all churches. The first remodeled palaces (all around 1640) were the residences in Zülz (Biała), Żyrowa, Oberglogau (Głogówek), Palais Heberstein in Grafenort (Gorzanów) by Carlo Lurago (1653–57) and the palace in Proskau (Prószków) by G. Seregni between 1677 and 1683. The palace in Sagan, started by Albrecht von Wallenstein and later in possession of the von Lobkowicz family, was modeled after Bohemian standards. The Jesuit seminar in Neisse (1656–58) was built by Melchior Werner, who represented the first generation of Silesian architects after the war. Important for the Protestant European architecture were the three Churches of Peace in Glogau, Jauer and Schweidnitz. Its constructor, military engineer Albrecht von Säbisch from Breslau, had to deal with a number of political constraints defined at the Peace of Westphalia. The churches should be built outside of the city walls, without stones and without a tower. The result were churches designed after Dutch and French examples, but with local traditions. A second variant of Protestant churches were so called border churches, simple buildings made of cheap materials, located outside of the borders of Silesia in the surrounding countries and used as refuges for the suppressed Silesian Protestants. Between 1680 and 1740 the Silesian baroque entered a period of prosperity. The palace in Suhlau (Sułów), built in 1680, was the first building made with all representative stylistic elements of the baroque era. The Althans family constructed several palace ensembles in Wölfelsdorf (Wilkanów) and Mittelwalde (Międzylesie), Konrad Ernst Maximilian von Hochberg expanded castle Fürstenstein (Książ; 1718–25, carried out by F. A. Hammerschmidt and F. A. Scheffler), 10