Historical Events in Church Annals for April 10:
The first organ in France is installed in the Church of Saint Cornielle in Compiegne, France by Pepin, King of France and future Holy Roman Emperor.
England's Richard I leads his army out of Sicily, leaving the area vulnerable to the Hohenstaufen forces and greatly hurting the Papal States power.
Pope Marcellus II is elected the 222nd in the line of Peter, but he does not last a month, dying on May 1, 1555. He was the last Pope to maintain his baptismal name. In just three short weeks he would stamp his own sense of austerity and justice on the curia. He would interest himself greatly in the Russian and Mongolian peoples and, after his death, Pierluigi da Palestrina would compose the famous "Mass of Pope Marcellus."