 Kọ itẹsiwaju fun paragirafi yii - Frederick ni ọmọ ọdọ ti Duke Leopold III 13511386 ati iyawo rẹ Viridis d. 1414, ọmọbìnrin Bernabò Visconti, Olúwa ìlú Milan. Gegebi adehun ti 1379 ti Neuberg, baba rẹ ṣe ijọba lori awọn agbegbe Habsburg Inner Austrian ti Styria, Carinthia, Carniola, bakanna bi lori Tyrol ati awọn ohun-ini Austrian ti o wa ni Swabia. Lẹyìn ikú díẹ tí Duke Leopold kú ní 1386 ní Ogun Sempach : , Frederick ati awọn arakunrin rẹ William, Leopold IV ati Ernest ni akọkọ wa labẹ itọsọna ti arakunrin wọn Duke Albert III ti Austria. 