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In page Albrecht Giese:

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Open conflict between the Polish king and the city council broke out when the city council was arrested for opposing the loss of certain privileges according to the terms of the declared Union of Lublin, which the city had not agreed to. Negotiations between the city and the king took place in 1568/69, initially at Piotrków Trybunalski. Giese was a member of a delegation, led by the mayor of the city, Johann Brandes in negotiations. Despite being subjected to severe pressure and incarceration for a year at Kraków[citation needed], the delegation refused to submit to the king's terms, thereby upholding independence, Giese and Councilor Georg Kleefeld were eventually released in 1570 against a ransom of 100,000 guilders.