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1200–1300 · Medieval

Helladius of Kiev was a monk and saint. His feast day at the Kyiv Caves monastery is on the Saturday after 14 September.

990–1055 · Medieval

Hilarion or Ilarion was the first non-Greek Metropolitan of Kiev and all Rus'. He held the metropolitan post before or during the ongoing 11th century East–West Schism.

822–882 · Medieval

Hilarion the Iberian (Georgian: ილარიონ ქართველი, romanized: ilarion kartveli) (c. 822-875) was a Georgian monk from the Kakheti region, bishop of David Gareja. He was considered as the thaumaturgus and is venerated as a saint.

1150–1186 · Medieval

Saint Bishop Ioann II (John) of Novgorod (Russian: Иоанн Новгородский, his name upon entering the Great Schema and the name by which he is known in Russian Orthodox hagiography), before 1185 known as Ilya of Novgorod was Archbishop of Novgorod from 1165 to his death in 1186.

1160 · Medieval

John of the Kiev Caves, also known as the Sufferer (died 1160, Kiev Pechersk Lavra), was a Ukrainian Christian monk venerated as a saint by the Russian Orthodox Church, which celebrates his feast day on July 18 and September 28.

1090 · Medieval

The Venerable Isaac was an Eastern Orthodox monk who died in 1090. He is buried at the Kyiv Pechersk Lavra, the same location where he died.

640–700 · Medieval

Isḥaq of Nineveh (Syriac: ܡܪܝ ܐܝܣܚܩ ܕܢܝܢܘܐ, romanized: mār isḥāq d-ninwē; Arabic: إسحاق النينوي Ishaq an-Naynuwī; c. 613 – c. 700), also remembered as Saint Isaac the Syrian (Ancient Greek: Ἰσαὰκ ὁ Σύρος), Isaac of Nineveh, Abba Isaac, Isaac Syrus and Isaac of Qatar, was a 7th-ce…

1050–1090 · Medieval

Isaiah of Rostov (fl. 1062 – died 1089 or 1090) was a Russian Christian missionary and bishop. His feast day in the Russian Orthodox Church is celebrated on May 15. Isaiah was born near Kiev. He was tonsured at Kiev Pechersk Lavra, and became abbot of Saint Dmitry's Monastery.

1304–1341 · Medieval

Ivan I Danilovich Kalita (Russian: Иван I Данилович Калита, lit. 'money bag'; c. 1288 – 31 March 1340) was Prince of Moscow from 1325 and Grand Prince of Vladimir from 1331 until his death in 1340.

505–578 · Medieval

Jacob Baradaeus , also known as Jacob bar Addai or Jacob bar Theophilus, was the Bishop of Edessa from 543/544 until his death in 578. He is venerated as a saint in the Oriental Orthodox Churches and his feast day is 31 July.

451–521 · Medieval

Jacob of Serugh , also called Jacob of Sarug or Mar Jacob (Syriac: ܡܪܝ ܝܥܩܘܒ, romanized: Mār Yaʿquḇ), was one of the foremost poets and theologians of the Syriac Christian tradition, second only to Ephrem the Syrian and equal to Narsai.

1392 · Medieval

Saint James of Rostov was an Eastern Orthodox bishop and priest. He died in 1392 at the Spaso-Yakovlevsky Monastery and is recognized as a prelate.

901–1030 · Medieval

Joachim of Korsun (Russian: Иоаким Корсунянин) was the first bishop of Novgorod the Great (r. ca. 989 – 1030). His surname suggests he probably came from the Byzantine town of Cherson (Korsun) on the Crimean Peninsula and, according to the chronicles, arrived in Kievan Rus' aroun…

1192–1254 · Medieval

John III Doukas Vatatzes, Latinized as Ducas Vatatzes (Greek: Ἰωάννης Γ´ Δούκας Βατάτζης, romanized: Iōánnēs Doúkās Vatatzēs; c. 1192 – 3 November 1254), was Emperor of Nicaea from 1221 to 1254. He was succeeded by his son, known as Theodore II Doukas Laskaris.

1280–1360 · Medieval

John Koukouzeles Papadopoulos (Greek: Ιωάννης Κουκουζέλης Παπαδόπουλος, romanized: Ioannis Koukouzeles Papadopoulos) was a Byzantine composer, singer and reformer of Byzantine chant. He was recognized as a saint by the Eastern Orthodox Church after his death.

1000–1070 · Medieval

John Mauropous (Greek: Ἰωάννης Μαυρόπους, Iōánnēs Maurópous, lit. "John Blackfoot") was an Eastern Roman poet, hymnographer, and author of letters and orations, who lived in the 11th century. John Mauropous was born in Paphlagonia around 1000.

985 · Medieval

John Tornike (Georgian: იოანე თორნიკე, romanized: ioane tornik'e; Greek: Ιωάννης Τορνίκιος), also known as Tornike Eristavi (Georgian: თორნიკე ერისთავი; died in 985) was a retired Georgian general and monk who came to be better known as a founder of the formerly Georgian Orthodox…

1350–1423 · Medieval

Jovan Uroš Nemanjić (Serbian Cyrillic: Јован Урош Немањић) or John Ouresis Doukas Palaiologos or Joasaph of Meteora (Greek: Ιωάννης Ούρεσης Δούκας Παλαιολόγος, romanized: Iōannēs Ouresēs Doúkas Palaiologos), was the ruler of Thessaly from c. 1370 to c.

675 · Medieval

John V of Constantinople (Greek: Ἰωάννης; died August 675) was the Ecumenical Patriarch of Constantinople from 669 to 675. He had ecumenically been proceeded by Thomas II of Constantinople.

791 · Medieval

John of Gothia (Greek: ᾿Ιωάννης ἐπίσκοπος τῆς Γοτθίας, Iōánnēs epískopos tēs Gotthiás; died c. 791 AD) was a Crimean Gothic metropolitan bishop of Doros, and rebel leader who overthrew and briefly expelled the Khazars from Gothia in 787.

876–946 · Medieval

Saint John of Rila, also known as Ivan Rilski (Bulgarian: Свети преподобни Иван Рилски Чудотворец, romanized: Sveti prepodobni Ivan Rilski Chudotvorets, lit. 'Saint John of Rila the Wondermaker'; c. 876 – 18 August 946), was the first Bulgarian hermit.

850–901 · Medieval

John the Exarch (also transcribed Joan Ekzarh; Church Slavonic: Їѡаннъ Єѯархъ Bulgarian: Йоан Екзарх) was a medieval Bulgarian scholar, writer and translator, one of the most important men of letters working at the Preslav Literary School at the end of the 9th and the beginning o…

920–1005 · Medieval

John the Iberian (Georgian: იოანე მთაწმინდელი; died c. 1002) was a Georgian monk, who is venerated as a saint. His name refers to his origins from the Kingdom of the Iberians.

1470 · Medieval

Jonah, born John (Russian: Иона, Iona; died November 5, 1470), was a Russian Orthodox archbishop who served as Bishop of Novgorod between 1458 and 1470.

1390–1461 · Medieval

Jonah of Moscow (Russian: Иона, romanized: Iona; died 31 March 1461) was Metropolitan of Kiev and all Rus', the primate of the Russian Orthodox Church, from 1448 until his death in 1461.

816–886 · Medieval

Joseph the Hymnographer (Greek: Όσιος Ιωσήφ ο Υμνογράφος, romanized: Ósios Iosif o Ymnográfos) was a Greek monk of the ninth century. He is regarded as one of the greatest liturgical poets and hymnographers of the Eastern Orthodox Church.

990–1016 · Medieval

Jovan Vladimir or John Vladimir (Serbian Cyrillic: Јован Владимир; c. 990 – 22 May 1016) was the ruler of Duklja, the most powerful Serbian principality of the time, from around 1000 to 1016.

810–865 · Medieval

Kassia, Cassia, Kassiane, or Kassiani was a Byzantine-Greek composer, hymnographer and poet. She holds a unique place in Byzantine music as the only known woman whose music appears in the Byzantine liturgy.

1219–1238 · Medieval

Christina of Vladimir (c. 1219–1238) was a pious princess of Vladimir, the wife of Prince Vladimir Yuryevich and daughter-in-law of Grand Prince Yuri II Vsevolodovich of Vladimir.

1262 · Medieval

Bishop Cyril (died May 21, 1262) was the Bishop of Rostov and Yaroslavl from 1230 to 1262. He served as the abbot of the Nativity of the Theotokos Monastery in Vladimir. He governed the diocese from April 6, 1230 (or 1231), until nearly the day of his death.

1492 · Medieval

Cosmas of Yakhroma (Church Slavonic: Venerable Cosmas of Yakhroma) is a saint of the Orthodox Church. He lived in the 15th century. He took monastic vows at the Kiev Pechersk Lavra, where he resided for some time.

768–853 · Medieval

Konstanti Kakhay or Konstanti Kakhi (Georgian: კონსტანტი კახაჲ; კონსტანტი კახი) (768 – November 10, 853) was a Christian Georgian nobleman from Kartli, who was seized captive by the Abbasid general Bugha al-Kabir during his 853 expedition into the Caucasus.

1001–1113 · Medieval

Kuksha of the Kiev Caves (Russian: Кукша Печерский, romanized: Kuksha Pechersky; died after 1114) was a monk and martyr from the Kiev Pechersk Lavra.

1329–1389 · Medieval

Lazar Hrebeljanović (Serbian Cyrillic: Лазар Хребељановић; c. 1329 – 15 June 1389) was a medieval Serbian ruler who created the largest and most powerful state on the territory of the disintegrated Serbian Empire.

1286–1391 · Medieval

1402–1483 · Medieval

Macarius of Kalyazin (born Matvey Vasilyevich Kozhin; c. 1402 – March 17, 1483) was a Russian religious figure and a saint of the Russian Orthodox Church. The son of a boyar, he founded the Trinity Makaryev Monastery, where he also served as abbot.

1349–1444 · Medieval

Macarius of the Yellow Water Lake and the Unzha, the Miracle Worker (Russian: Преподобный Макарий Унженский Желтоводский Чудотворец, romanized: Prepodobny Makariy Unzhenskiy Zheltovodskiy Chudotvorets; 1349–1444) was a Russian Orthodox monk and saint.

1450–1497 · Medieval

Makary I was an Eastern Orthodox priest born in 1450 and a citizen of Poland. He served as the Metropolis of Kiev, Galicia and all Ruthenia until his death in 1497. He is buried in Saint Sophia Cathedral and is venerated as a hieromartyr.

1392–1444 · Medieval

Mark of Ephesus (Greek: Μᾶρκος ὁ Ἐφέσιος, born Manuel Eugenikos, also called Markos Eugenikos) was a hesychast theologian of the late Palaiologan period of the Byzantine Empire who became famous for his rejection of the Council of Ferrara–Florence (1438–1439).

1050 · Medieval

The precise dates of the lives of hermit Mark of the Caves, (also known as Mark the Grave-digger) and the two brothers Theophil and John are not recorded, however, their story is preserved in the Kiev Caves Paterikon.

1300–1400 · Medieval

Martyrius of the Kiev Caves (late 13th – early 14th century) was a monk of the Kiev Pechersk Lavra. Due to his great purity of soul and strict fasting, he was ordained a deacon and possessed the gift of performing miracles.

1250–1305 · Medieval

Maximus or Maximos (Russian: Максим, romanized: Maksim; Ukrainian: Максим, romanized: Maksym; died 6 December 1305) was a metropolitan bishop of the Metropolis of Kiev and all Rus' in the Ecumenical Patriarchate of Constantinople.

1150–1239 · Medieval

Mercury of Smolensk, also known as Mercurius of Smolensk (date and place of birth unknown; according to tradition, he died on November 24, 1239, in Smolensk), was a legendary saint of the Orthodox Church, a martyr, and a hero of the battles against the Mongols during their invasi…

1138–1222 · Medieval

Saint Michael Choniates (or Acominatus; Greek: Μιχαὴλ Χωνιάτης or Ἀκομινάτος; c. 1140 – 1220) was a Byzantine Greek writer and cleric, born at Chonae (the ancient Colossae). At an early age he studied at Constantinople and was the pupil of Eustathius of Thessalonica.

950–992 · Medieval

Michael I of Kyiv was an Eastern Orthodox priest born in 950 in Bulgaria or Syria. He served as the Metropolitan of Kiev and all Rus' until his death in 992 in Kyiv. He is a prelate buried at the Kyiv Pechersk Lavra.

1453 · Medieval

Michael of Klopsk (Russian: Михаил Клопский, romanized: Mikhail Klopsky; died 1456) was a Russian Orthodox monk and fool for Christ associated with the Klopsky Monastery of the Holy Trinity, located near Novgorod on the river Veryazha.

1271–1319 · Medieval

Mikhail Yaroslavich (Russian: Михаил Ярославич; 1271 – 22 November 1318) was Prince of Tver from 1285 and Grand Prince of Vladimir from 1304 to 1314 and again from 1315 until his death in 1318. He was canonized and counted among the saints of the Russian Orthodox Church.

1335–1405 · Medieval

Princess Milica Hrebeljanović née Nemanjić (Serbian: Милица Немањић Хребељановић · ca. 1335 – November 11, 1405) also known as Empress (Tsaritsa) Milica, was a royal consort of Serbia by marriage to Prince Lazar, who fell in the Battle of Kosovo.

537–634 · Medieval

Saint Modestus of Jerusalem (Greek: Μόδεστος Ιεροσολύμων) was Patriarch of Jerusalem from 632–634. He is commemorated as a saint by the Catholic Church on December 17, and by the Eastern Orthodox Church, on May 17, March 29 or December 16.

574–668 · Medieval

Saint Gabriel of Beth Qustan (Syriac: ܡܪܝ ܓܒܪܐܝܠ: Mor Gabriel), also known as Saint Gabriel of Qartmin, was the Bishop of Tur Abdin until his death in 648. He is venerated as a saint in the Oriental Orthodox Church and his feast day is 23 December.