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Grégoire IX (pape, 1145?-1241) : Epistula ad Marin. Filangieri Archiep.barensem, Portal Biblissima. Permalink: https://biblissima.demo.logilab.fr/ark:/43093/oedata34633ce4b9ecc1653875684fef95a0b2c78f2320 (seen 17/10/2026)
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