January 3rd 1521: Martin Luther excommunicated
On this day 1521, Pope Leo X issued the papal bull ‘Decet Romanum Pontificem’ which excommunicated Martin Luther. Luther was a German monk who became disillusioned from the Catholic Church due to its corruption, such as taking money from people as a guarantee into heaven. Luther protested this corruption by famously writing his ‘95 Theses’ in 1517, an event which symbolically began the Protestant Reformation. The Pope did not accept Luther’s anti-Catholic writings and eventually expelled him from the church in 1521.