Biography of Silvestre III, Pope and Antipope of the Church
Silvestre III (Giovanni dei Crescenzi Ottaviani, Rome, around 1000 - Sabina, around 1063) was Pope No. 146 of the Catholic Church in 1045 and declared antipope a few months later by Benedict IX. Supported by the Crescencios, he snatched the papal tiara to Benedict IX on January 20, 1045, but he, supported by the counts of Túsculo, deposed Silvestre on March 10 of that year, thus recovering the papacy.