Guillaume de Marcillat

1470–1529) was a French painter and stained glass artist.

He was in Rome by 1509, where he was employed by the popes Julius II and Leo X in the Vatican and at Santa Maria del Popolo, where the two windows in the choir are his earliest surviving works.

In 1515, he was summoned by Cardinal Silvio Passerini to Cortona, where he established a workshop, that produced stained glass windows for the Madonna del Calcinaio Cathedral.

He also painted biblical frescos in the vault of the Cathedral of Arezzo.

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