The Battle of Anghiari (Leonardo da Vinci)
In 1504 Leonardo da Vinci was given the commission by gonfaloniere Piero Soderini, a contract signed by Niccolò Machiavelli, to decorate the Hall of Five Hundred. At the same time his rival Michelangelo, who had just finished his "David", was designated the opposite wall. This was the only time that Leonardo da Vinci and Michelangelo worked together on the same project. The painting of Michelangelo depicted an episode from the Battle of Cascina, when a group of bathing soldiers was surprised by the enemy. However Michelangelo did not stay in Florence long enough to complete the project. He was able to finish his cartoon, but only began the painting. He was invited back to Rome in 1505 by the newly appointed Pope Julius II and was commissioned to build the Pope's tomb.
Pietà (Michelangelo)
Sculpting of the work took less than two years. Following completion, the "Pietà"'s first home was the Chapel of Santa Petronilla, a Roman mausoleum near the south transept of St. Peter's, which the Cardinal chose as his funerary chapel. The chapel was later demolished by Bramante during his rebuilding of the basilica. According to Giorgio Vasari, shortly after the installation of his "Pietà", Michelangelo overheard (or asked visitors about the sculptor) someone remark that it was the work of another sculptor, Cristoforo Solari, whereupon Michelangelo signed the sculpture. Michelangelo carved (Michelangelo Buonarroti, Florentine, made this) on the sash running across Mary's chest. The signature echoes one used by the ancient Greek artists, Apelles and Polykleitos. It was the only work he ever signed. Vasari also reports the anecdote that Michelangelo later regretted his outburst of pride and swore never to sign another work of his hands.