On 20 October 1470, Casimir IV and Frederick signed a treaty in the city of Graz, and a possible marriage between Hedwig and Maximilian was also discussed.
Pada tanggal 20 Oktober 1470 Kazimierz IV dan Friedrich menandatangani perjanjian di kota Graz, di sini dibahas kemungkinan pernikahan di antara Jadwiga dan Maximilian.