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797–877 · Medieval

Ignatius of Constantinople (Greek: Ἰγνάτιος; 798 – 23 October 877) was the Ecumenical Patriarch of Constantinople from 847 to 858 and from 867 to 877. Ignatius lived during a complex time for the Byzantine Empire.

550–627 · Medieval

Saint Ignoroc de Vannes was a presbyter who served as a bishop. He was born in 550 and died in 627.

1096–1147 · Medieval

Igor II Olgovich (died September 19, 1147) was Prince of Chernigov and Grand Prince of Kiev (1146). He was a son of Oleg I of Chernigov. He was the chosen successor of his brother, Vsevolod II of Kiev.

501–600 · Medieval

Ilère is a saint of the Catholic Church and a former bishop of Gévaudan. The spelling of his name has evolved; depending on the source and era, it appears as Éli, Yles, Ilère, or Hilaire (not to be confused with Hilary of Poitiers).

1045 · Medieval · Benedictines

Ilario di Matera was a Benedictine monk born in Matera. He died in 1045 in Castel San Vincenzo and is recognized as a Catholic saint.

607–667 · Medieval · Benedictines

Ildefonsus or Ildephonsus (rarely Ildephoses or Ildefonse; Spanish: San Ildefonso; c. 8 December A.D. 607 – 23 January A.D. 667) was a scholar and theologian who served as the Metropolitan Archbishop of Toledo for the last decade of his life. His Gothic name was Hildefuns.

480–540 · Medieval

Illtud , also known as Illtud Farchog or Illtud the Knight, is venerated as the abbot teacher of the divinity school, Bangor Illtyd, located in Llanilltud Fawr (Llantwit Major) in Glamorgan, Wales.

1280 · Medieval · Franciscans

Illuminatus of Arce (Italian: Illuminato dell'Arce) or Illuminatus of Rieti (Illuminato da Rieti) was an earlier follower of Francis of Assisi.

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.

1000–1076 · Medieval

Emad (also transliterated as Imad, Imed and Aimad; Arabic: عماد) is an Arabic masculine given name and surname and means "support" or "pillar".

1322–1333 · Medieval · Nuns of the Order of Preachers

Imelda Lambertini (1322 – 12 May 1333) was an Italian Catholic mystic and devotee of the Dominican Order. She is the patroness of First Communicants and many dioceses make use of her feast as a day to schedule First Communions and Confirmations.

710 · Medieval

Indract or Indracht was an Irish saint who, along with his companions, was venerated at Glastonbury Abbey, a monastery in the county of Somerset in south-western England.

670 · Medieval

Ine or Ini (died in or after 726) was King of Wessex from 689 to 726. At Ine's accession, his kingdom dominated much of what is now southern England.

1001–1050 · Medieval

Ingegerd Olofsdotter, also known as Irene or Anna (1001 – 10 February 1050), was a Swedish princess and the grand princess of Kiev from 1019 to 1050 as the wife of Yaroslav the Wise. She was the daughter of the Swedish king Olof Skötkonung by his wife Estrid of the Obotrites.

605 · Medieval

Ingenuinus or Ingenuin, also Jenewein (d. c. 605), was the second historically confirmed bishop of Sabiona or Säben. He is venerated as a saint. Little is known of his life. He was probably bishop of Sabiona from 577 to his death in about 605 and of Roman descent.

1225–1276 · Medieval · Dominican Order

Pope Innocent V (Latin: Innocentius V; c. 1225 – 22 June 1276), born Pierre de Tarentaise, was head of the Catholic Church and ruler of the Papal States from 21 January to 22 June 1276. A member of the Order of Preachers, he acquired a reputation as an effective preacher.

543 · Medieval

Innocent of Le Mans (died 559) was a Bishop of Le Mans who held the see between 532 and 543. He is a Christian saint whose feast day is June 19. He was likely of local origin and was trained and educated by Bishop Victor II (511–530), his godfather.

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.

1150–1215 · Medieval

Ioane Shavteli (Georgian: იოანე შავთელი) was a Georgian poet of the late 12th and early 13th centuries credited to have written the encomiastic poem traditionally, and unsuitably, known as Abdulmesiani (აბდულმესიანი), i.e., "Slave of the Messiah" (from Arabic عبد المسيح, Abdul Ma…

1494 · Medieval

John of Ustyug (died May 29, 1494) was a saint and a fool-for-Christ of Ustyug. He was born near the Trinity-Gleden Monastery in the village of Pukhovo. His parents, Savva and Maria, were wealthy farmers who relocated to the town of Orlets on the Yug River.

762–826 · Medieval

Joseph the Confessor (d. Constantinople, 832) was a 9th-century Archbishop of Thessalonica and brother of Theodore Stoudites. He is commemorated as a saint on 14 July by the Eastern Orthodox Church.

820–921 · Medieval

Christian ascetic saint

752–803 · Medieval

Irene of Athens (Greek: Εἰρήνη, Eirḗnē; 750/756 – 9 August 803), surname Sarantapechaena (Greek: Σαρανταπήχαινα, Sarantapḗchaina), was Byzantine empress consort to Emperor Leo IV from 775 to 780, regent during the childhood of their son Constantine VI from 780 until 790, co-ruler…

1088–1134 · Medieval

Irene of Hungary (Greek: Είρήνη, born Piroska; 1088 – 13 August 1134) was the Byzantine empress by marriage to John II Komnenos. She is venerated as an Eastern Orthodox saint.

635–653 · Medieval

Saint Irene of Tomar (Portuguese: Santa Iria) (c.635 – c.653) was a Christian who was martyred for her faith in Visigothic Portugal. Her parents, wishing to protect her, sent her to a convent school and a private tutor.

831–866 · Medieval · Benedictines

Irmgard of Chiemsee (German: Selige Irmgard, also Irmengard; c. 831/833 – 16 July 866), a member of the Carolingian dynasty, was the second daughter of King Louis the German and his wife Hemma. She was the first abbess of Frauenwörth abbey from 857 until her death.

700–716 · Medieval · Benedictines

Irmina of Oeren (also called Ermina and Hirmina; died 720) was a saint, founder and abbess of a convent in Oeren, near Trier (Trèves), and co-founder of a convent in Echternach (now eastern Luxembourg).

1110–1178 · Medieval · Cistercians

Isaac of Stella, O.Cart, also referred to as Isaac de l'Étoile, (c. 1100, in England – c. 1170s, Étoile, Archigny, France) was a Cistercian (and later Carthusian) monk, theologian and philosopher.

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…

552 · Medieval

Saint Isaak von Syrien was a hermit who died in 552.

1225–1270 · Medieval · Poor Clares

Isabelle of France (March 1225 – 23 February 1270) was a French princess and daughter of Louis VIII of France and Blanche of Castile. She was a younger sister of King Louis IX of France (Saint Louis) and of Alfonso, Count of Poitiers, and an older sister of King Charles I of Sici…

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.

501–550 · Medieval

Saint Isan was a 6th-century saint of South Wales and Patron Saint of Llanishen in Cardiff, Wales. He was said to have been a follower of the 6th-century Celtic teacher St Illtyd. In A.D.

980–1048 · Medieval · Benedictines

Isarn de Sant Víctor was a Benedictine monk born in 980 who served as the abbot of Saint-Victor of Marseille. He died in 1048 and is recognized as a saint within the Catholic Church.

600–501 · Medieval

Isfael or Ismael (Old Welsh: Ysmail), often anglicised as Ishmael, was a 6th-century medieval Welsh bishop of Rhos and saint. He was allegedly also a Breton prince of Armorica.

1200–1204 · Medieval · Premonstratensians

Isfrid of Ratzeburg was a Premonstratensian Prince-Bishop of Ratzeburg. Isfrid was a professed canon of the Cappenberg monastery in Westphalia. In 1159, Isfrid was appointed the Provost of Jerichow. There he finished construction of the Romanesque collegiate church of St.

560–636 · Medieval

Isidore of Seville (Latin: Isidorus Hispalensis; c. 560 – 4 April 636) was a Hispano-Roman scholar, theologian and archbishop of Seville. He is widely regarded, in the words of the 19th-century historian Charles Forbes René de Montalembert, as "the last scholar of the ancient wor…

1079–1130 · Medieval

Isidore the Laborer, born Isidro de Merlo y Quintana, also known as Isidore the Farmer (Spanish: San Isidro Labrador) (c. 1070 – 15 May 1130), was a Mozarab farmworker who lived in medieval Madrid.

1474 · Medieval

Born in Brandenburg, Isidoro of Rostov died in 1474 in Rostov Veliky. He is buried in Rostov Veliky and is recognized as a thaumaturge.

1244 · Medieval · Dominican Order

Isnardo da Chiampo, OP (d. 19 March 1244) was an Italian Catholic priest and professed member in the Order of Preachers. He studied in Bologna (where Dominic of Osma himself received him into his order) and in Milan before preaching in northern Italian cities such as Brescia and…

950–1014 · Medieval

Saint Israel of Le Dorat was born around 950 into a noble family in Le Dorat, at the gate of Dinsac, between Limoges and Poitiers. A stone cross marks the site of his house. His feast day is December 12 in the Roman Martyrology and September 13 locally.

1472 · Medieval

Isidore of Dorpat (died 1472, Dorpat) was a priest of St. Nicholas Church in Dorpat who, according to tradition, was killed for refusing to convert to Catholicism.

592–652 · Medieval · Benedictines

Itta of Metz, OSB (also Ida, Itte or Iduberga; 592–8 May 652) was the wife of Pepin of Landen, Mayor of the Palace of the Kingdom of Austrasia.

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.

1040–1116 · Medieval

Ivo of Chartres, Can.Reg. (also Ives, Yves, or Yvo; Latin: Ivo Carnutensis; c. 1040 – 23 December 1115), was a French canon regular and abbot who then served as the Bishop of Chartres from 1090 until his death.

1253–1303 · Medieval · Third Order of Saint Francis

Ivo of Kermartin, TOSF (17 October 1253 – 19 May 1303), also known as Yvo, Yves, or Ives (and in Breton as Erwan, Iwan, Youenn or Eozenn, depending on the region, and known as Yves Hélory (also Helori or Heloury) in French), was a parish priest among the poor of Louannec, the onl…

501–700 · Medieval

Saint Ivo (also known as Ives) was a Cornish bishop and hermit, and became the eponymous saint of St Ives, Huntingdonshire. The discovery of Bishop Ivo's remains in 1001 was first mentioned briefly in John of Worcester's Chronicon ex chronicis.

704 · Medieval

Iwig (alternatively Iwi, Iwigius, or Ywi of Lindisfarne) was a saint venerated in Wiltshire, England in the Middle Ages. He was reputedly a Northumbrian monk, said to have died and to have been buried in Brittany.

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.