Nicolaus Copernicus surviving primary documents on the early years of Copernicus's childhood and education. Copernicus biographers assume that Watzenrode first sent young Copernicus to St. John's School, at Toruń, where he himself had been a master. Later, according to Armitage, the boy attended the Cathedral School at Włocławek, up the Vistula River from Toruń, which prepared pupils for entrance to the University of Kraków, Watzenrode's alma mater in Poland's capital. In the winter semester of 1491–92 Copernicus, as "Nicolaus Nicolai de Thuronia", matriculated together with his brother Andrew at the University of Kraków (now Jagiellonian University). Copernicus began his studies in the
Nicolaus Copernicus a natural choice for German-speaking students, regardless of their ethnicity or self-identification. The surname "Kopernik", "Copernik", "Koppernigk" is recorded in Kraków from c. 1350, in various spellings, apparently given to people from the village of Koperniki (prior to 1845 rendered Kopernik, "Copernik, Copirnik" and "Koppirnik") in the Duchy of Nysa. Nicolas Copernicus' great-grandfather is recorded as having received citizenship in Kraków in 1386. The toponym "Kopernik" (modern "Koperniki") has been variously tied to the Polish word for "dill" ("koper") and German for copper ("Kupfer"). The suffix -nik (or plural -niki) denotes a Slavic and Polish agent noun, though. As was