Rosselli, Cosimo [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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