before rose once again in the German Peasants' War, Stuttgart was occupied by the peasant armies for a few days in the Spring of 1525. Ulrich, with the help of Philip I, Landgrave of Hesse, seized the chance to restore himself to power (albeit as an Austrian vassal) in the turmoil of the Reformation and War with the Turks and invited Erhard Schnepf to bring the Reformation to Stuttgart. He accepted, was named Court Preacher in Stuttgart, and worked in concert with Ambrosius Blarer until his dismissal following his resistance to the Augsburg Interim by the Duke in 1548. Duke Ulrich himself died two years later, and was succeeded by his son, Christoph. He had grown up in a Württemberg in turmoil, and wished to rebuild its image. To this end, he once again began a construction boom all over the Duchy under the direction of Court Architect Aberlin Tretsch; knowing full well that the time of the Reisekönigtum was over, Christoph and Tretsch rebuilt and remodeled the Old Castle into a Renaissance palace, and from 1542 to 1544, what is today the Schillerplatz was built as a town square. Duke Christoph also responded to the increasing made for drinking water by embarking upon a massive hydraulic engineering project in the form of a tunnel to Pffaf Lake, the Glems, and the Nesenbach from 1566 to 1575. In 1575, Georg Beer was also appointed Court Architect, and he built the Lusthaus. But it was architect Heinrich Schickhardt who would carry Tretsch's torch further; Schickhardt constructed the Stammheim Castle in the suburb of Stammheim, rebuilt the Fruchtkasten in the today's Schillerplatz, and expanded the Prinzebau. The Thirty Years' War devastated the city, and it would slowly decline for a period of time from then on. After the catastrophic defeat of the Protestant Heilbronn League by the Habsburgs at Nörlingen in 1634, Duke Eberhard III and his court fled in exile to Strasbourg, abandoning the Duchy to looting by pro-Habsburg forces. The Habsburgs once again had full reign of the city for another four years, and in that time Stuttgart had to carry the burden of billeting the pro-Habsburg armies in Swabia. Ferdinand III, King of the Romans, entered the city in 1634 and, two years later in 1636, once again attempted to re-Catholicize Württemberg. The next year, the Bubonic plague struck and devastated the population. The Duke returned in 1638 to