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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…

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John of Thessalonica (in Latin, Joannes) was Archbishop of Thessalonica in the 7th century. He was an important defender of the Orthodox faith against 7th-century Monothelitism.

1875–1937 · Contemporary

Joasaph was an Eastern Orthodox priest and bishop born in 1874 in Lynovytsia. He died in 1937 in Kursk and is recognized as a hieromartyr.

1886–1937 · Contemporary

Born in 1886 in Ufa, Joazaf served as an Eastern Orthodox priest and bishop. He died in 1937 in Kazan and is recognized as a hieromartyr. He held citizenship in the Russian Empire and the Soviet Union.

1560–1631 · Reformation

Job Boretsky (Ukrainian: Йов, secular name Ivan Matfeyevich Boretsky, Polish: Iwan Borecki, died 2 March 1631) was the Metropolitan of Kiev, Galicia and all Rus' in the Ecumenical Patriarchate of Constantinople in the Eastern Orthodox Church from 1620 to 1631.

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.

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Saint John Kalliergus was an Eastern Orthodox priest and bishop born in Agios Ioannis. He died in Cyprus and is recognized as a saint by the Eastern Orthodox Church.

1871–1917 · Contemporary

Ivan Alexandrovich Kochurov (Russian: Иван Александрович Кочуров; Russian: Иоанн Кочуров) (13 July 1871 (Ryazan, Russia) – 31 October 1917 (Tsarskoye Selo, Russia)), better known as John Kochurov, was a Russian priest of the Russian Orthodox Church who was martyred during the Oct…

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.

1878–1937 · Contemporary

John Nikolsky was an Eastern Orthodox priest born in 1878 in Bezhetsky Uyezd. A citizen of the Soviet Union, he died in 1937. He is recognized as a hieromartyr.

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.

1829–1909 · Contemporary

John of Kronstadt or John Iliytch Sergieff (pre-reform Russian: Іоаннъ Кронштадтскій; post-reform Russian: Иоанн Кронштадтский; 31 October [O.S. 19 October] 1829 – 2 January 1909 [O.S.

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.

1896–1966 · Contemporary

Saint John of Shanghai and San Francisco (Russian: Иоанн Шанхайский и Сан Францисский, romanized: Ioann Shankhayskiyi i San Frantsiskyi; born Mikhail Borisovich Maximovitch, Russian: Михаил Борисович Максимович; June 4, 1896 – July 2, 1966) was a prelate of the Russian Orthodox C…

1795–1867 · Modern

John of Sviatohirsk (secular name Ivan Kryukov; September 20, 1795, Kursk — August 11, 1867, Sviatohirsk Lavra) was a monk of the Sviatohirsk Lavra and a recluse.

1651–1715 · Modern

John of Tobolsk (Russian: Иоанн Тобольский; 1651–1715), born Ioann Maksimovich Vasilkovskiy (Russian: Иоанн Максимович Васильковский; Ukrainian: Іван Максимович Васильківський, romanized: Ivan Maksymovych Vasylkivskyi) was a teacher, writer and clergyman of Ukrainian Cossack orig…

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.

400 · Early Church

John the Warrior (Greek: Ἰωάννης ὁ στρατιώτης, Russian: Иоанн Воин, Ioann Voin) or John the Soldier in the Catholic Church is a Christian saint and martyr. He was born in the 4th century and lived until his death in the Byzantine Empire.

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.

1888–1925 · Contemporary

Bishop Jonah (secular name Vladimir Ilyich Pokrovsky, Russian: Владимир Ильич Покровский; April 17, 1888 – October 20, 1925), was a titular bishop of Hankou of the Russian Orthodox Church Outside Russia (ROCOR).

1802–1902 · Contemporary

Iona of Kyiv, born Ivan Pavlovich Miroshnichenko in 1802 in Kremenchuk and died on January 9, 1902, in Kyiv, was an Orthodox saint, venerable, and wonderworker. He was respected as a starets during his lifetime. Saint Iona founded the Holy Trinity Monastery in Kyiv in the 1860s.

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.

1500–1502 · Reformation

Jovan Branković was the titular Despot of Serbia from 1493 until his death in 1502. The title of despot was given to him by Hungarian king Vladislas II of Hungary. From 1493 to 1497 he held the title together with his elder brother Đorđe Branković, who was despot from 1486.

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.

350–458 · Early Church

Saint Juvenal (Greek: Άγιος Ιουβενάλιος) was Bishop of Jerusalem from 422. On the See of Jerusalem being recognised as a Metropolitinate by the Council of Chalcedon, he became the first Metropolitan of Jerusalem, an office he occupied until his death in 458.

1761–1796 · Modern

Juvenaly of Alaska (Russian: Иеромонах Ювена́лий; 1761, Yekaterinburg, Russia – 1796, Kuinerrak, Alaska), Protomartyr of America, was a Russian hieromartyr and member of the first group of Orthodox missionaries who came from the monasteries of Valaam and Konevets to evangelize th…

1878–1937 · Contemporary

Juvenaly, born Yevgeny Alexandrovich Maslovsky (January 15, 1878, in Livny – died the night of October 24–25, 1937), was a Russian Orthodox bishop who was venerated as a new martyr from 2000 to 2013.

1876–1934 · Contemporary

Archbishop John (Latvian: Аrhibīskaps Jānis, Russian: Архиепископ Иоанн, secular name Jānis Pommers or Ivan Andreyevich Pommer, Russian: Иван Андреевич Поммер; 6 (18) January 1876 – 29 September (12 October) 1934) was the first Latvian Archbishop of the Latvian Orthodox Church, s…

1884–1966 · Contemporary

Sebastian, born Stepan Vasilyevich Fomin (October 28, 1884, in Kosmodemyanskoye, Oryol Governorate – April 19, 1966), was a Russian Orthodox clergyman and a member of the Synaxis of New Martyrs and Confessors of Russia.

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.

1560–1624 · Reformation

Ketevan the Martyr (Georgian: ქეთევან წამებული, romanized: ketevan ts'amebuli) (c. 1560 – September 13, 1624) was a queen consort of Kakheti, a kingdom in eastern Georgia. She was regent of Kakheti during the minority of her son Teimuraz I of Kakheti from 1605 to 1614.

1813–1882 · Modern

George IV Kerestedjian (Armenian: Գևորգ Դ Քերեստեճյան), also known as George IV of Constantinople or Gevork IV Kostandnupolsec‘i (born 1813, died in Etchmiadzin on December 6, 1882), was the Armenian Patriarch of Constantinople from 1856 to 1860, and subsequently Catholicos of th…

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.

1864–1937 · Contemporary

Konstantin, secular name Konstantin Grigoryevich Dyakov (born May 9/21, 1871 or 1875 in the Chernigov Governorate, died November 10, 1937, in Kyiv) was a bishop of the Russian Orthodox Church and a new martyr.

1852–1918 · Contemporary

Konstantin Dmitriyevich Golubev (Russian: Константи́н Дми́триевич Го́лубев; 27 March 1896 – 9 June 1956) was a Soviet general and army commander. He was born in Petrovsk, Saratov Governorate (in present-day Saratov Oblast).

1874–1918 · Contemporary

Konstantin Minyatov was a Russian Empire lawyer born in 1874 in Oryol. He died in 1918 in Yekaterinburg from a gunshot wound. He is recognized as a saint within Eastern Orthodoxy.

1770–1800 · Modern

Konstantinos of Hydra was born in 1770 in Hydra and was a citizen of the Ottoman Empire. He died in 1800 in Rhodes. He is recognized as a canonized saint within Eastern Orthodoxy.

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.

1876–1938 · Contemporary

Nikolai Konstantinovich Krasovsky (May 7, 1876, Vladimir Governorate — January 31, 1938, Butovo firing range, Moscow Oblast) was a priest and a saint of the Russian Orthodox Church, canonized as a hieromartyr in 2001 for veneration by the entire church.

1859–1937 · Contemporary

Kronid, born Konstantin Petrovich Lyubimov (1 May/13 May 1859 in Levkiyevo – 10 December 1937 at the Butovo firing range), was a Russian Orthodox monk, archimandrite, and the last superior of the Trinity Lavra of St. Sergius before its closure by the Bolshevik authorities.

1875–1964 · Contemporary

Kuksha of Odessa, born Kuzma Kirillovich Velichko (25 January [O.S. January 12] 1875 in Arbuzynka, Kherson Governorate, Russian Empire – 24 December 1964 in Odessa, USSR), was an imperial Russian priest and a Ukrainian Orthodox Church (Moscow Patriarchate) saint who was canonized…

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.