Cardinal-priest. 103rd pope. He saw the Saracens attack Rome, Italy in 846; upon his ascension, to prevent its recurrence he fortified the city and its suburbs, building a wall around the Vatican, fortifying the part of Rome still called the Leonine City. Rebuilt Saint Peter’s Basilica. Rebuked Saint Ignatius of Constantinople for deposing bishops without his knowledge. Crowned Louis II joint Holy Roman Emperor with Lothair I in 850. Crowned Alfred as king of England in 853.
- Book of Saints, by the Monks of Ramsgate
- Lives of the Saints, by Father Alban Butler
- New Catholic Dictionary
- Our Sunday Visitor’s Encyclopedia of Saints
- “Pope Saint Leo IV“. Saints.SQPN.com. 13 July 2013. Web. 6 December 2013. <>