Pope Callixtus II
William I (1020 – 12 November 1087), called the Great ("le Grand" or "Tête Hardie", "the Stubborn"), was Count of Burgundy from 1057 to 1087 and Mâcon from 1078 to 1087. He was a son of Renaud I and Alice of Normandy, daughter of Richard II, Duke of Normandy. William was the father of several notable children, including Pope Callixtus II.