Upon completing his studies in Kraków, Nicolaus ’ uncle ​ — who by now had become the bishop of Warmia — ​ asked him to move to Frombork, a city on the Baltic Sea.
Kui Mikołaj Kopernik oli õpingud Krakówis lõpetanud, tegi onu, kellest oli saanud Warmia piiskop, talle ettepaneku kolida Balti mere äärsesse linna Fromborki.