Kaiserdom St. Bartholomäus
Konrad was appointed canon in Mainz in 1396. In 1414, he became provost of Frankfurt Cathedral and governor of the Eichsfeld (an exclave of the Bishopric of Mainz). The residence of the governor was Rustenberg Castle, near Heiligenstadt. On 10 October 1419, he was elected archbishop of Mainz, and his election was confirmed by Pope Martin V on 15 December 1419. In this period, the residence of the Archbishops of Mainz was Ehrenfels Castle, now in Hesse, because the citizens of Mainz, which was a free imperial city, were hostile to the clergy.