Tiedemann Giese

Tiedemann Giese (1 June 1480 – 23 October 1550), was a member of the patrician Giese family of Danzig (Gdańsk, Poland). The Gieses originated from Unna in Westphalia. His father was Albrecht Giese and his brother, the Hanseatic League merchant Georg Giese. Another relative was Albrecht Giese. Tiedemann became Bishop of Culm (Chełmno) first canon, later Prince-Bishop of Ermland (Warmia).

Giese was born in Danzig. At age 24, he (and Mauritius Ferber) became a priest at the Catholic Church of St. Peter and St. Paul. Giese was supported by Chancellor Lucas David.

Bishop Giese was a close friend of the later famous astronomer and proponent of heliocentrism Nicolaus Copernicus. In 1516, he was the co-author, together with Copernicus, of a letter to the Polish King Sigismund I the Old asking for the King's protection of Prussia against the Teutonic Knights, and generally supported the interests of the Polish Crown against that of the Teutonic Order. He also worked on updating the Kulm law while a canon at Ermland. On 1 July 1536 he was designated by King of Poland, Sigismund I, who considered him a very valuable diplomat, as Bishop of Culm, which was later confirmed by the Pope. After Mauritius Ferber's death Giese became prince-bishop.

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