 Complete the following phrase:  Frederick was the youngest son of Duke Leopold III 13511386 and his wife Viridis d. 1414, a daughter of Bernabò Visconti, Lord of Milan. According to the 1379 Treaty of Neuberg, his father ruled over the Habsburg Inner Austrian territories of Styria, Carinthia, Carniola, as well as over Tyrol and the dynastys original Further Austrian possessions in Swabia. After the early death of Duke Leopold in the 1386 