Although he defeated his sister-in-law, Joanna, Duchess of Brabant, and briefly took her title, she regained it the following year with the help of Charles IV, Holy Roman Emperor.
Meskipun ia mengalahkan saudara iparnya, Joanna, Adipati Brabant, dan mengambil gelarnya, dia kembali pada tahun berikutnya dengan bantuan dari Karl IV, Kaisar Romawi Suci.