Roman Catholic and Orthodox persons on these forums might to be interested that book previously available in Russian only is now available in English.
Mikhail E. Posnov’s History of Church until 1054 available at www.authorhouse.com in English. Book has been very helpful in helping Russian Greek Catholics and Orthodox better understand Papacy. Also provides Catholics an Eastern view of Papacy which is factual and honest.
If you have read it please comment.