Marcin Kromer or Martin Cromer (German: Martin Cromer; 1512 – 23 March 1589) was Prince-Bishop of Warmia (Ermland), a cartographer, diplomat and historian in Poland and later in the Polish-Lithuanian Commonwealth. He was personal secretary to two Kings of Poland, Sigismund I the Old and Sigismund II Augustus.
Read more about Marcin Kromer: Life, Bibliography