On 17 January 1414, the Archbishop of Mainz John II of Nassau documented that the abbess and convent of Altmünster at Mainz had transferred one third of the court at Heidesheim to the Archbishopric. Outside this arrangement were the "Vogtei" with all its appurtenances, the income and the landholdings that were part of the convent's estate. This was confirmed in writing to the convent for all time by the Archbishop with the cathedral deacon's and the cathedral capitular's consent. Moreover, Altmünster was henceforth to be freed of all contributions and levies imposed by the Archbishop or the cathedral capitular. Both pledged henceforth to protect and defend the convent with all its holdings and rights – particularly the remaining two thirds of the court at Heidesheim Der Mainzer und Magdeburger Erzbischof Kardinal Albrecht von Brandenburg bestätigte die Verfügung seines Vorgängers am 22. Oktober 1522.