** Pope Celestine I ( Roman Catholic Church )

** Pope Sixtus I

** Pope Stephen I

** Stephen I of Hungary

** Aristotelian commentaries: Metaphysics, Prior Analytics I, Topics, De sensu and Meteorology,

** Andronikos I Komnenos ( 1118 – 1185 )

** Andronikos I of Trebizond ( 1222 – 1235 )

** " Hello, John ," I said.

** Bayezid I Mosque and complex ( külliye )

** To form the passive voice: " I was told that you wanted to see me "

** Cassius Dio's account of Claudius ' reign, part I

** Henry I ( 1031 – 1060 )

** Philip I ( 1060 – 1108 )

** John I ( 1316 )

** Francis I ( 1515 – 1547 )

** Alphonse I ( 1139 – 1185 )

** Sancho I ( 1185 – 1211 )

** Peter I ( 1357 – 1367 )

** Ferdinand I ( 1367 – 1383 )

** Charles I ( 1266 – 1285 )

** Joanna I ( 1343 – 1382 )

** René I ( 1435 – 1442 )

** Charles I ( 1266 – 1285 )

** Ferdinand I ( 1815 – 1825 )

** Francis I ( 1825 – 1830 )

** Eutychius of Constantinople ( Byzantine Church )

** Translation of the Acheiropoietos icon from Edessa to Constantinople.

** Helena of Constantinople ( Roman Catholic Church )

** Menas of Constantinople

** Alexander of Constantinople

** Capetian House of Courtenay – Latin Emperors of Constantinople ( 1217 – 1283 )

** Flavian of Constantinople

** Paul I of Constantinople

** Patriarch Anatolius of Constantinople

** May 1453 lunar eclipse-Fall of Constantinople

** Theodosia of Constantinople ( Eastern Orthodox Church )

** Patriarch Germanus I of Constantinople ( Eastern Church )

** Gregory of Nazianzus, Doctor, Bishop of Constantinople, 389 CE ( commemoration, Anglican Communion )

** Helena of Constantinople, also known as " Feast of the Holy Great Sovereigns Constantine and Helen, Equal-to-the-Apostles.

** Gennadius of Constantinople ( Greek Orthodox Church )

** Nectarius of Constantinople

** Ignatius of Constantinople

** Britain, France and Russia agree to give Constantinople and the Bosporus to Russia in case of victory ( the treaty is later nullified by the Bolshevik Revolution ).

** Ankara replaces Constantinople as the capital of Turkey.

** Ecumenical Patriarch Athanasius II of Constantinople ( all killed in, or shortly after, the siege of Constantinople )

** Patriarch Leo of Constantinople

** Byzantine-Ottoman Wars – The Ottoman governor of Thessaly, Turakhan Beg, breaks through the Hexamilion wall for the fourth time and ravages the Peloponnese peninsula, to prevent the Byzantine Despotate of the Morea from assisting Constantinople during the final Ottoman siege of the imperial capital.

** Genoese ships fleeing the Black Death plague in Kaffa stop in Constantinople, contaminating the city.