| Term | Definition |
| roman catholicism | the beliefs and practices of the Catholic Church based in Rome |
| diocletian | He was a general that became emperor in A.D. 284, introduced reforms |
| constantine | a walled city in northeastern Algeria east of Algiers |
| palestine | an ancient country is southwestern Asia on the east coast of the Mediterranean |
| constantinople | capital of the Byzantine Empire; Byzantinium & Istanbul |
| byzantine empire | a continuation of the Roman Empire in the Middle East after its division in 395 |
| eastern orthodox christianity | A branch of Christianity that developed in the Byzantine Empiret and that did not recognize the pope as its surpreme leader |