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The Archdiocese of Siena-Colle di Val d'Elsa-Montalcino is a Roman Catholic archdiocese in Tuscany. The seat of the archbishop is the Cathedral of the Assumption in Siena. Until 1459, the diocese was immediately subject to the Holy See , and its bishops attended the Roman synods. In 1459, Pope Pius II made Siena a metropolitan archbishopric.
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