Gregor IX., Papst2024-01-022024-01-021234-10-0530.05.19801234-10-057399https://urkundenrepositorium.uni-marburg.de/handle/lba/11243imageCC-By 4.0 Internationalhttps://creativecommons.org/licenses/by/4.0/Papst Gregor IX. an Basel, Stift St. Peter, Propst; Basel, Stift St. Peter, Kapitel - 5.10.123430.05.1980