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650–705 · Medieval · Benedictines

Hædde (died 705) was a medieval monk and Bishop of Winchester. Hædde is believed to have been born in Headingley, Leeds, and became a monk of Whitby Abbey.

500 · Medieval

Ia of Cornwall (also known as Eia, Hia, Ive or Hya) was an evangelist and martyr of the 5th or 6th centuries, flourishing in the area of St Ives, Cornwall. She is said to have been an Irish princess, the sister of Erc of Slane.

445–540 · Medieval

Iarlaithe mac Loga , also known as Jarlath , was an Irish priest and scholar from Connacht, remembered as the founder of the monastic School of Tuam and of the Archdiocese of Tuam, of which he is the patron saint.

500–502 · Medieval

Ibar mac Lugna, whose name is also given as Iberius or Ivor, was an early Irish saint, patron of Beggerin Island, and bishop. The saint is sometimes said to have been one of the "Quattuor sanctissimi Episcopi" ("The four most sacred bishops") said to have preceded Saint Patrick i…

1260 · Medieval · Cistercians

Ida of Leeuw is a saint who was born in Gors-Opleeuw and died around 1260. Ida's parents were Giselbert and Ida of Leeuw. Ida was raised by the beguines in Borgloon and at the age of 13 joined the Cistercian abbey at Rameige (Dutch: Rameien), now known as Jauchelette.

788–825 · Medieval

Saint Ida of Herzfeld (c. 770 – 4 September 825) was the widow of a Saxon duke who devoted her life to the poor following the death of her husband in 811. Her feast day is September 4.

1211–1290 · Medieval

Ida of Louvain (died around 1300) was a Cistercian nun of Roosendael Abbey in the 13th-century Low Countries who is officially commemorated in the Catholic Church as blessed. Ida was born into a well-to-do family in Leuven, Duchy of Brabant (now Belgium).

1140–1226 · Medieval

Ida of Toggenburg (c. 1140 – 3 November 1226) (also: Idda, Ita, Itha, Itta, Ydda, Judith and Gutta of Fischingen) is a Swiss Christian nun, venerated as a saint in the Diocese of Constance especially in Fischingen, Switzerland.

1100–1167 · Medieval · Cistercians

Saint Idesbald (Idesbaldus) (c. 1100–1167) was a Cistercian monk and abbot of Ten Duinen Abbey. As a youth Idesbald was a courtier and page to the Count of Flanders. It is believed that he was related to or proceeded from the noble family of Van der Gracht, lords of Moorsel.

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.

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.

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.

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.

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…

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.

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).

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.

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.

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.

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.

767 · Medieval

Jacob was a Catholic priest who served as the Roman Catholic Bishop of Toul. He died in 767 and is recognized as a saint in the Catholic Church.