 In spite of this, relations between the Emperor and the Elector were not friendly, and during the next few years Joachim was frequently in communication with Charles' enemies.In the course of Hohenzollern power politics Joachim Nestor and his brother managed to get the latter, Albert of Mainz, first onto the sees of Magdeburg and then its suffragan of Halberstadt, both prince-bishoprics also comprising princely territories.Since prince-episcopal sees were so influential, competing candidates usually ran for them.