380: Christianity becomes the state religion of the Roman Empire, the leaders are called patriarchs.
395: The Byzantine Empire is created by Emperor Constantine I. He changed the name of a Greek city named Byzantium and called it Constantinople, making it the capital of his new kingdom.
529: Justinian I becomes the emperor and finishes his new code of laws. One of his best advisors was his wife, Theodora.
863–869: Christianity spreads to Kiev, a very important city in what is today Russia.
1054: The Great Schism separates the Roman Catholic and Orthodox Church.
1453: The Ottoman Turks conquer Constantinople and rename it Istanbul.