Mauritius Ferber

He had stayed in England in 1497 before returning to his home town, where he in 1498 claimed to be engaged to Anna Pilemann, a wealthy heiress, by presenting parts of her clothes as proof.

During peace talks in Cracow in 1525, he managed to defend the except bishopric against demands of both the Polish king and the former Teutonic Grandmaster who became the first Duke of Prussia.

Until 1531, Ferber managed to improve the economic situation in his diocese as well as preventing towns from becoming Lutheran, with Elbląg (Elbing) being the exception to this rule.

Either on 23 February 1534 or 1 March 1535, Ferber suffered a cerebral stroke, which left him unable to speak, and Copernicus wrote a prescription which was approved by the king of Poland's physician.

As an executor of Ferber's will, Copernicus helped to make the funeral arrangements and an inventory of the bishop's belongings.