Cathedra Petri, Books 6-8: From The Middle Of The Ninth To The Close Of The Tenth Century is a historical book written by Thomas Greenwood and published in 1859. The book covers a period of time from the middle of the 9th century to the end of the 10th century, and it focuses on the history of the Papacy during this time. The title of the book, Cathedra Petri, refers to the Chair of Saint Peter, which is a symbol of the authority of the Pope. The...