Duke Leopold III of Austria, born in 1351, was a member of the House of Habsburg. He was the son of Duke Albert II of Austria and Joanna of Pfirt. Leopold III is known for his role in the political landscape of the Holy Roman Empire during the late 14th century, particularly in the context of territorial disputes and alliances. Leopold III ruled over the Duchy of Austria and was instrumental in expanding Habsburg influence. He is also remembered for his efforts in promoting trade and economic development in the region. His reign contributed to the strengthening of the Habsburg dynasty, which would play a significant role in European history.