In 1402 however, after a long period of decline, in an extreme move to preserve it the then provost, Heinrich von Ellerbach, gave the establishment to the Carthusians, a move which proved extremely successful in reviving Buxheim both spiritually and economically. Its wealth however drew the hostile attentions of the nearby city of Memmingen, which occupied it in 1546 during the Reformation, and impounded its property. Prior Dietrich Loher was able however by skilful diplomacy to obtain the favour of Emperor Charles V, and in 1548 the monastery was declared "reichsfrei", and thus independent of all territorial authority save that of the Emperor himself, under whose protection it stood; it was the only charterhouse ("Reichskartause") in Germany ever to be granted that status.