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Grégoire III (patriarche de Constantinople, 14..?-1459) : Epistula ad Michaelem Lygizum, Portal Biblissima. Permalink: https://biblissima.demo.logilab.fr/ark:/43093/oedatac44a02c5796eae81103a6438fc9fddf7396cd904 (seen 17/10/2026)
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