Article from a Catholic apologist site on the Great Schism between Rome and Constantinople.

Article from the Catholic Encyclopedia.

Three articles from Protestant and Orthodox perspectives.

Several articles from a Protestant perspective on the Great Schism that divided the Catholic and Orthodox Churches.

A lecture by Yuri Koszarycz covering the Eleventh to the Thirteenth centuries in the life of the Catholic church.

An essay on the development of this dispute.

Article which gives background information on the situation in the Balkans from a Catholic view.