brother, Albert II the Lame (1330–1358) succeeded Frederick. The pattern of corule persisted, since Albert had to share the role with another younger brother Otto I the Merry (1330–1339), although he did attempt to unsuccessfully lay down the rules of succession in the "Albertinian House Rule" (Albertinische Hausordnung). When Otto died in 1339, his two sons, Frederick II and Leopold II replaced him, making three simultaneous Dukes of Austria from 1339 to 1344 when both of them died in their teens without issue. Single rule in the Duchy of Austria finally returned when his son, Rudolph IV succeeded him in 1358. In the 14th century the Habsburgs began to accumulate other provinces in the vicinity of the Duchy of Austria, which had remained a small territory along the Danube, and Styria, which they had acquired with Austria from Ottokar. In 1335 Albert II inherited the Duchy of Carinthia and the March of Carniola from the then rulers, the House of Gorizia. Rudolph IV and the Privilegium Maius (1358–1365) Rudolf IV the Founder (1358–1365) was the first to claim the title of Archduke of Austria, through the Privilegium Maius of 1359, which was actually a forgery and not recognized outside of Austria till 1453. However it would have placed him on a level footing with the other Prince-electors of the Holy Roman Empire. Rudolph was one of the most active rulers of his time, initiating many measures and elevating the importance of the City of Vienna. At that time Vienna was ecclesiastically subordinate to the Diocese of Passau, which Rudolph subverted by founding St Stephen's Cathedral and appointing the provost as the Archchancellor of Austria. he also founded the University of Vienna (Alma Mater Rudolphina). He improved the economy and established a stable currency, the Vienna Penny (Wiener Pfennig). When he died in 1365 he was without issue and the succession passed to his brothers jointly under the Rudolfinian House Rules (Rudolfinische Hausordnung). In 1363, the County of Tyrol was acquired by Rudolph IV from Margaret of Tyrol. Thus Austria was now a complex country in the Eastern Alps, and these lands are often referred to as the Habsburg Hereditary Lands, as well as simply Austria, since the Habsburgs also began to accumulate lands far from their Hereditary Lands. Albert III and Leopold III: A house divided (1365–1457) Almost the entire 15th Century was a confusion of estate and family disputes,