Presumably born in The Hague, Joanna was the second child of Duke Albert I of Bavaria (1336--1404), by his first wife Margaret (1342--1386), a daughter of the Piast duke Louis I of Brzeg. Her siblings included Count William VI of Holland, Johanna Sophia of Bavaria and Margaret of Bavaria. Her paternal grandparents were Emperor Louis IV and his consort Countess Margaret II of Hainaut.
Johanna Sophia
Margaret of Bavaria