Before he was elected Archbishop of Gniezno he was a teacher and tutor of the king's sons Wladyslaw and Kazimierz.

At the end of May 1434 Wladyslaw Jagiello contracted pneumonia while out listening to the songs of nightingales in the woods near Przemyśl[2] and died on 1 June at the age of 83.

Two years later, when the post of archbishop of Gniezno became vacant, the new king put his tutor into the office.

[6] Kot was also a statesman of great stature, skillfully moving through court and church politics and operating in diplomatic channels.

[10] He was remembered at that time as "extremely shrewd, energetic and devout, looking forward to universal respect and trust".