Later the hall was enlarged by Giorgio Vasari so that Grand Duke Cosimo I could hold his court in this chamber. During this transformation, famous (but unfinished) works were lost, including the "Battle of Cascina" by Michelangelo, and the "Battle of Anghiari" by Leonardo da Vinci. Leonardo was commissioned in 1503 to paint one long wall with a battle scene celebrating a famous Florentine victory. He was always trying new methods and materials and decided to mix wax into his pigments. Da Vinci had finished painting part of the wall, but it was not drying fast enough, so he brought in braziers stoked with hot coals to try to hurry the process. As others watched in horror, the wax in the fresco melted under the intense heat and the colors ran down the walls to puddle on the floor. A legend exists that Giorgio Vasari, wanting to preserve Da Vinci's work, had a false wall built over the top of "The Battle of Anghiari" before painting his fresco. Attempts made to find Da Vinci's original work behind the Vasari fresco have so far been inconclusive.