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In page Erfurt:

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In 1530, the city became one of the first in Europe to be officially bi-confessional with the Hammelburg Treaty. It kept that status through all the following centuries. The later 16th and the 17th century brought a slow economic decline of Erfurt. Trade shrank, the population was falling and the university lost its influence. The city's independence was endangered. In 1664, the city and surrounding area were brought under the dominion of the Electorate of Mainz and the city lost its independence. The Electorate built a huge fortress on Petersberg hill between 1665 and 1726 to control the city and instituted a governor to rule Erfurt.[citation needed]