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It remained the seat of the bishopric Maillezais until 1648, when the bishopric was transferred to the St. Louis Cathedral of La Rochelle.
In 1821 a see was established at Luçon, and had under its jurisdiction, aside from the former Diocese of Luçon, almost the entire former Diocese of Maillezais; so that Maillezais, once transferred to La Rochelle, no longer belongs to the diocese, now known as La Rochelle et Saintes.