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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.
With exception of the Eichsfeld, a small Catholic area in the northwestern part of Thuringia, which was a former property of the archdiocese of Mainz, Catholics were a small minority right from the start of Communist rule.
He studied at the University of Paris and became the treasurer of the archdiocese of Mainz, then provost of the cathedral.