Leopold IV of Austria (1371 – 3 June 1411), known as the Fat, was Duke of Austria, jointly with his brother William the Courteous until 1406, from 1386 to 1411.
Biography
Leopold was the second son of Leopold III. His eldest brother, William of Inner Austria, created the younger Leopold effective co-ruler, putting him in charge of Further Austria, which also included lands in Aargau. Leopold faced Swiss opposition to Austrian administration. From 1391 onwards, he was effective ruler of Further Austria, and from 1396 to 1406 he was also ruler in Tyrol.
Leopold married Catherine of Burgundy, daughter of Philip II, Duke of Burgundy, in 1393. She died in 1425, and they had no surviving children.
His younger brothers, Ernest and Frederick, were initiated with ducal positions in 1402. In 1406 their eldest brother William died without heirs, and Leopold became the next head of their family. Leopold had no sons either. The younger brothers made an agreement how to divide the patrimony in the future: Ernest was to receive Inner Austria and Styria, and Frederick Further Austria, including Tyrol. Leopold was left with responsibility of the Further Austrian territories, together with the position of head of the family.
In 1406, Leopold took over the guardianship of their young cousin Albert V, which resulted in conflicts with his brother Ernest. Leopold died on 3 June 1411 in Vienna and was buried in the Ducal Crypt in the city's cathedral.