"I have had to recognize my incapacity to adequately fulfill the ministry entrusted to me. For this reason, and well aware of the seriousness of this act, with full freedom I declare that I renounce the ministry of Bishop of Rome, Successor of Saint Peter."
-- Pope Benedict XVI announcing his resignation as the spiritual leader of the Catholic Church. A pope has not resigned since 1415. Benedict cited declining mental and physical health as his reasons for leaving his position.