On the night of 28 October 1462 Adolph captured the city of Mainz, killed 400 citizens and had another 400 including Johannes Gutenberg exiled, and revoked its town charter and status as an Imperial City.
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In 1461 he went to Nuremberg for Imperial and Papal reform, and its recommendations earned him the wrath of both the Emperor Frederick III and Pope Pius II.
Diether von Isenburg (1412–1482), German priest, Archbishop of Mainz (1459–1462 and 1475–1482)
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In order to protect the Thuringian areas of the Archdiocese of Mainz around Erfurt and in the Eichsfeld area, archbishop Diether von Isenburg and the cathedral chapter of Mainz appointed Aldalbert, who was still a minor, in 1477 as Provisor of the city of Erfurt and High Bailiff of Rusteberg Castle in Rustenfelde in the Eichsfeld.