[1][2] Jan Rzeszowski was born into a family that claimed the Półkozic coat of arms.

[3] In his youth, he took part in the Battle at Varna[4] and managed to survive despite catastrophic losses experienced by the Poles and Hungarians.

[5] During his career as Bishop of Kraków, Rzeszowski pioneered the use of the printing press for the production and distribution of sacral literature.

[7] Rzeszowski provided funding for the Collegium Iuridicum of the Kraków Academy.

[8] According to Ludwik Łętowski, a later writer[9] referencing Długosz, Rzeszowski was disliked by the clergy.