Gregor IX., Papst2024-01-022024-01-021234-08-2109.06.19801234-08-213196https://urkundenrepositorium.uni-marburg.de/handle/lba/5931imageCC-By 4.0 Internationalhttps://creativecommons.org/licenses/by/4.0/Papst Gregor IX. an Ploceke, Kloster (Zisterzienser) - 21.8.123407.08.1981