In 1504, the city of Florence commissioned both Leonardo da Vinci and Michelangelo to paint massive murals on opposite walls of the Great Council Hall. This set up one of the greatest artistic 'showdowns' in history. The two masters famously disliked each other; the elder Leonardo was refined and scientific, while the younger Michelangelo was temperamental and unkempt. Leonardo was to paint the 'Battle of Anghiari' and Michelangelo the 'Battle of Cascina.' Ultimately, neither painting was completed. Leonardo experimented with a new oil-based technique that failed to dry, causing the paint to run, while Michelangelo was called away by the Pope to work on his tomb in Rome. Although the murals are lost, the preparatory sketches (cartoons) influenced generations of artists, defining the peak of the High Renaissance style.