Sebastiano del Piombo
Michelangelo's friend and collaborator Sebastiano del Piombo reported in a letter to him of 15 October 1520 on a private audience with Pope Leo X. After praising Michelangelo's work, the pope continued "But he is "terribile", as you see; one cannot deal with him". Sebastiano responded "that your "terribile" character did not harm anyone, and that you appear "terribile" for love of the great works you carry out."