Brief Biography-Cosimo Rosselli was born in Florence in 1439; he received his first instruction in the atelier of Neri di Bicci, the Florentine painter of religious subjects. He had many influences of the time, including Andrea del Verrocchio and Alesso Baldovinetti. Part of his success was his portrait of the Pico della Mirandola and other Florentine nobility; however, he also painted historical scenes in chapels. His most famous work was the commission by Pope Sixtus IV to paint frescos in the Sistine Chapel alongside Botticelli, Ghirlandaio and Perugino. His three works were the Last Supper, Christ Preaching near the Sea of Tiberias, and the Drowning of Pharaoh. He attempted to surpass or equal the work of his three contemporaries by making overuse of high-contrast ultramarine and gold to compensate for the lack of refinement in his paintings. This technique worked for most; however, Pope Sixtus IV was unimpressed and had his works altered or retouched by other artists.