Task: Question Understanding
Input (English): Passage: The rebellion of the city of Danzig  was a revolt from December 1575 to December 1577 of the city against the outcome of the Polish-Lithuanian royal election, 1576. The Polish throne was contested by Stephen Báthory and the Holy Roman Emperor Maximillian II. It began on 12 December 1575 when Emperor Maximillian was chosen as monarch by the Polish Senate, while the majority of the szlachta  had voted for Bathory. It ended on 16 December 1577. Maximilian's II death in fall of 1576 weakened Danzig's position and made the conflict less about the recognition of the ruler than about Danzig's privileges. With neither side being able to defeat the other militarily, a compromise was reached, with economic as well as religious privileges of the city being restored and recognized, in return for a large reparation and recognition of Bathory as the king.
Question: On what exact date did the Danzig rebellion begin?
Output (English): date