Rosselli, Cosimo kô´zēmō rōs-sĕl´lē [key], 1439–1507, Florentine painter. He was one of the artists summoned to Rome by Sixtus IV to assist in decorating the Sistine Chapel . He painted The Last Supper and other subjects for it. Of his many works in Florence the most famous is The Miracle-working Chalice in Sant' Ambrogio, a work that includes many contemporary portraits. He ran a large workshop. Among his pupils were Piero di Cosimo and Fra Bartolommeo . There are paintings by Rosselli in the Louvre; the National Gallery of Art, Washington, D.C.; and in the Walters Art Gallery, Baltimore.
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