abstract
| - Leopold III (1351 - 1386) was the Duke of Inner Austria, Carinthia, Styria and Margrave of Carniola from 1379 until 1386, the Count of the Tyrol from 1365 until 1386, and the Lord of Treviso from 1381 until 1384. Leopold was the fourth son of Archduke Albert II the Wise of Austria and Joan of Pfirt. After the death of his elder brothers Rudolph and Frederick he was made the ruler of the Tyrol. In 1368 he acquired Freiburg im Breisgau, and in 1375 Feldkirch also. Leopold bickered with his elder brother Albert, and by the Treaty of Neuburg of 9 September 1379 he received from Albert Carithia, Styria, and Carniola, as well as Habsburg possessions in Wiener Neustadt, Gorizia, Friuli, the Windisch March and Further Austria. In 1381 Leopold gained possession of Treviso, which was prior a territory of Venice, and the following year Trieste too. His attempts to expand further into Switzerland and Swabia culminated in the Battle of Sempach where he was killed on 9 July 1386. Leopold developed the lands he ruled in, and contributed largely to the establishment of a middle class. He married Viridis Visconti, the daughter of the Duke of Milan. With her, he had his four sons: William, Leopold, Frederick, and Ernest.
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