Bishopric of Constance was broken by Papal order in 1321. A year after the city became the principal seat of the Counts of Württemberg in 1320, the city was granted status as a city and given civic rights. At the end of the 14th century, new suburbs sprang up around Leonhard Church and near the city's fortifications as well. Towards the end of the 15th century, Count Ulrich V began construction of a new suburb on the northeastern edge of the city around the Dominican monastery Hospitalkirche. In the 1457, the first Landtag of the Estates of Württemberg was established in Stuttgart and a similar institution was established in Leonberg. After the temporary partitions of the County of Württemberg by the Treaties of Nürtingen, Münsingen, and Esslingen, Stuttgart was once again declared the capital of the county in 1483. Early Modern era In 1488, Stuttgart officially became the de facto residence of the Count himself as opposed to the location of his home, the Old Castle. Eberhard I, then Count Eberhard V, became the first Duke of Württemberg in 1495, and made Stuttgart the seat of the Duchy of Württemberg in addition to the County thereof. All this would be lost to the Württembergs during the reign of his son, Ulrich. Though Ulrich initially made territorial gains as a result of his decision to fight alongside the Emperor Maximilian I, he was no friend of the powerful Swabian League nor of his own subjects, who launched the Poor Conrad rebellion of 1514. Despite this and his rivalry with the Swabian League, his undoing would actually come in the form of his unhappy marriage to Sabina of Bavaria. In 1515, Ulrich killed an imperial knight and lover of Sabina's by the name of Hans von Hutten, obliging her to flee to the court of her brother, William IV, Duke of Bavaria, who successfully had Ulrich placed under Imperial ban twice. When the Emperor died in 1519, Ulrich struck, seizing the Free Imperial City of Reutlingen, prompting the League to intervene. That same year, Ulrich was soundly defeated and he was driven into exile in France and Switzerland following the League's conquest of Württemberg. Württemberg was then sold by the League to Emperor Charles V, who then granted it to his brother, Ferdinand I, thus beginning the 12 year ownership of the county by the Habsburgs. When the peasants Ulrich had crushed