Copernicus was born in 1473 in the city of Thorn (Toruń) in Royal Prussia, a mainly German-speaking state that was ruled by the Polish king since 1466. He was the son of the merchant Niklas Koppernigk and his wife Barbara Koppernigk (born Barbara Watzenrode). His native language was German. He was taught first in Cracow and then in Italy, where he graduated as a lawyer of the church. He also studied medicine to serve his fellow clerics. Copernicus spent most of his life working and researching in Frauenburg (Frombork), Warmia, where he died in 1543.