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Eastern Orthodoxy
Article from a Catholic apologist site on the Great Schism between Rome and Constantinople.
Eastern Schism
Article from the Catholic Encyclopedia.
Filioque Controversy
Three articles from Protestant and Orthodox perspectives.
Great Schism
Several articles from a Protestant perspective on the Great Schism that divided the Catholic and Orthodox Churches.
Innocent III and the Great Schism
A lecture by Yuri Koszarycz covering the Eleventh to the Thirteenth centuries in the life of the Catholic church.
Notes on the Filioque Clause Controversy
An essay on the development of this dispute.
Why Is There an Eastern Question?
Article which gives background information on the situation in the Balkans from a Catholic view.