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This fantastic Cathedral rises atop a hill in the upper part of the city, on the foundations of an ancient early Christian church where a Roman acropolis likely once stood. Begun in the Gothic style during the 13th century, the construction of the dome, dedicated to Saints Peter and Donatus, was not completed until three centuries later, in 1511, after numerous cycles of alteration. Its bell tower with tall, twin windows, designed by Luigi Mercanti, was built between 1857 and 1859. The last reconstruction of the façade was carried out between 1901 and 1914, based on a design by Viviani intended to replace the unfinished one dating back to the 15th century.  Dominating the city, this imposing three-nave building, without a transept, boasts seven beautiful stained-glass windows created by the monk and master glassmaker Guillaume de Marcillat from Berry. The French artist worked between Arezzo and Cortona from 1516. This masterpiece of glass art was created in two phases, between 1516 and 1517, and then between 1522 and 1524. These illustrious biblical tales can be admired in the vaults of the first three bays of the main nave and the first bay of the left aisle.
Also inside are the small but famous 15th-century fresco of Mary Magdalene by Piero della Francesca, glazed terracotta sculptures by Andrea della Robbia, and the tombs of the 14th-century Bishop Guido Tarlati and Pope Gregory X, who died in Arezzo in 1276.