Leopold IV, Duke of Austria (1371-1411), Habsburg Duke of the Leopoldinian Line, ruled from 1386
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He was succeeded by his eldest grandson Leopold IV, because his son, the Hereditary Prince Frederick, had predeceased him.
The Duke's Administrative Officer and close friend was Christian Raster, a German statesman.
After the rise of Nazism in Germany all three of his sons by his first wife became members of the party.
Through his father he was the nephew of Prince Leopold IV of Lippe who was married to his aunt Princess Bertha.
Anna married secondly to Leopold IV, Prince of Lippe, second eldest child of Count Ernst of Lippe-Biesterfeld and his wife Countess Karoline of Wartensleben, on 26 April 1922 in Büdingen.
The Principality of Lippe came to an end on 12 November 1918 with the abdication of Leopold IV, with Lippe becoming a Free State.
In the 1350s the Hungarian monarch, Louis I, was able to assemble a force of 50,000 men by joining his forces with reinforcements sent by the Duke of Austria, the Counts of Gorizia, the Lord of Padua, Francesco I da Carrara, and the Patriarchate of Aquileia, a state within the Holy Roman Empire.