7 dated entries naming Eastern Orthodoxy, drawn from 7 separate years between 375 CE and 1672 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
Also written as Eastern Orthodox in the source articles; Wikipedia redirects those to the same subject, so their entries are on this page.
375May 30 – Emmelia of Caesarea, Byzantine Eastern Orthodox priestsource
10th century
1000The papacy during this time was in a period of decline, in retrospect known as the saeculum obscurum ("Dark Age") or "pornocracy" ("rule of harlots"), a state of affairs that would result in the Great Schism between Roman Catholicism and Eastern Orthodoxy later in the 11th century.source
11th century
1054July 16 – East-West Schism: Humbert of Silva Candida, representative of the newly deceased Leo IX, breaks the relations between Western and Eastern Churches, through the act of placing an invalidly-issued Papal Bull of excommunication during the celebration of the Divine Liturgy.source
12th century
1182April – Massacre of the Latins: The Eastern Orthodox inhabitants of Constantinople massacre the Venetian, Genoan, and other Latin officials and traders who rule as agents of Empress Maria of Antioch. She is the mother and regent of 12-year-old Emperor Alexios II.source
14th century
1392Abbot Methodius of Peshnosha, Eastern Orthodox saintsource
16th century
1512Moldavia becomes a vassal of the Ottoman Empire, on the same conditions as Wallachia: the voivode will be designated by the Turks, but will be Eastern Orthodox Christians. Also, the Turks are not allowed to build mosques, to be buried, to own land or to settle in the country.source
17th century
1672March 16 – At the Synod of Jerusalem, presided over by Dositheos II of Jerusalem, the 68 bishops and representatives from the whole of Eastern Orthodox Christendom close by approving the Orthodox dogma against the challenge of Protestantism, declaring against "the falsehoods of the adversaries which they have devised against the Eastern Church" and making a goal of "reformation of their innovations and for their return to the catholic and apostolic church in which their forefathers also were."source