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Uddalaka Aruni (fl. c. 8th century BCE), (Devanagari: उद्दालक आरुणि) also referred to as Uddalaka or Aruni or Uddalaka Varuni, was a revered Vedic sage of Hinduism.

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Aré or Aregius of Nevers was bishop of Nevers in France and is known because he subscribed to the deeds of both the Fifth Council of Orléans, in 549 and the Second Synod of Paris in 551.

600–596 · Medieval

Saint Asaph (or Asaf, Asa) was, in the second half of the 6th century, the first Bishop of St Asaph, i.e. bishop of the diocese of Saint Asaph. No traditional Welsh account devoted to the life of Asaph exists. He is, though, well-attested to through place names.

1121–1195 · Medieval · Cistercians

Ascelina (1121–1195), was a French Cistercian nun and mystic. Ascelina spent the majority of her life at the Cistercian convent at Boulancourt, Haute-Marne, France. It is believed that she was a relative of St. Bernard.

384 · Early Church

Saint Ascholius (Ἀσχόλιος, d. 383/4) was Bishop of Thessalonica from AD 379 until his death, at the time of the adoption of Christianity as the state religion of the Roman Empire. He baptized Emperor Theodosius I.

334–406 · Early Church

Saint Asella, also known as Osella and Ocella (c. 334–c. 406), was a Roman virgin and hermit who was a disciple and friend of Saint Jerome, who spoke of her in his writings.

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Ashkhen (Armenian: Աշխէն, flourished second half of the 3rd century & first half of the 4th century) was the Queen of Armenia and a member of the Arsacid dynasty by marriage to King Tiridates III of Armenia. Ashkhen was a monarch of Sarmatian origins.

800–826 · Medieval

Ashot I the Great (Georgian: აშოტ I დიდი ashot I didi) (died 826/830) was a presiding prince of Iberia (modern Georgia), first of the Bagratid family to have attained to this office c. 813.

100–200 · Early Church

Aspren or Asprenas (Italian: Sant'Asprenato, Sant'Aspreno, Sant'Aspremo) was a 1st-century Christian saint and venerated as the first Bishop of Naples.

490 · Early Church

Assicus (Asicus, Assic) was the first bishop of Elphin, Ireland, and venerated as the patron saint of that place. He was also an artisan metalworker. Assicus was a friend of St. Patrick, and a skilled metal worker in brass and copper.

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Grata of Bergamo (early 4th century) is an Italian saint and martyr, and sister of Asteria of Bergamo. Her parents were Saint Lupo of Bergamo and Saint Adelaide, duke and duchess of Bergamo. According to hagiographer Agnes B.C.

335–410 · Early Church

Saint Asterius of Amasea (Greek: Ἀστέριος Ἀμασείας, c. 350 – c. 410 AD) was made Bishop of Amasea between 380 and 390 AD, after having been a lawyer. He was born in Cappadocia and probably died in Amasea in Pontus, now in Turkey.

262 · Early Church

Asterius of Caesarea was a Roman senator who became a Christian martyr. After Asterius gave a Christian burial to the Roman soldier Marinus of Caesarea, who suffered martyrdom, he too was condemned to death and beheaded.

223 · Early Church

Asterius of Ostia (d. 3rd century AD) was a martyred priest venerated as a saint in the Catholic Church. Information on him is based on the apocryphal Acts of Saint Callixtus.

365 · Early Church

Asterius of Petra was a convert from Arianism, and later the Bishop of Petra. Asterius was one of the defenders of the Council of Nicæa and St. Athanasius. At the Council of Sardica, in 343, Asterius denounced Arianism, as a heresy.

100–117 · Early Church

Astius (died AD 98 AD; Albanian: Asti, Greek: Άστιος) is a 2nd-century Christian martyr venerated by the Roman Catholic and Eastern Orthodox churches. He was the bishop of Dyrrhachium (now Durrës in Albania).

955–1030 · Medieval · Benedictines

Saint Astrik of Pannonhalma (also known as Anastasius, Astericus, Ascrick, Astrissicus) (died c. 1030/1040) is a saint of the 11th century. Radla was a Czech or Croat from Bohemia, who was a monk in Hungary.

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Athanasia is a genus of flowering plants in the daisy family. Athanasia is native to southern Africa. The name is derived from the Greek a-, 'without', and thanatos 'death', alluding to the persistent dry involucral bracts.

701–860 · Medieval

Athanasia of Aegina (c.790 in Aegina – 15 August 860 in Timia, Greece) was a Byzantine saint and abbess. Athanasia's hagiographer called her "this praiseworthy woman, who bears the name of immortality, who lived her life admirably".

1597–1654 · Reformation

Athanasius III of Constantinople (Greek: Ἀθανάσιος; born Alexios Patellarios, Ἀλέξιος Πατελλάριος; Russian: Алексий Пателла́рий; 1597 – 5 April 1654) was the Ecumenical Patriarch of Constantinople in 1634 and 1652.

830–872 · Medieval

Saint Athanasius I (c. 832 – 872) was the bishop of Naples from 850 to his death. This Athanasius should not be confused with his nephew, Athanasius II.

1230–1310 · Medieval

Athanasius I of Constantinople (Greek: Ἀθανάσιος; c. 1230 – 28 October 1310) was the Ecumenical Patriarch of Constantinople for two terms, from 1289 to 1293 and from 1303 to 1309. He was born in Adrianople and died in Constantinople.

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Athanasius II of Constantinople (Greek: Ἀθανάσιος) is reckoned as the last Ecumenical Patriarch of Constantinople before the Fall of Constantinople.

296–373 · Early Church

Athanasius I of Alexandria (c. 296–298 – 2 May 373), also called Athanasius the Great, Athanasius the Confessor, or, among Coptic Christians, Athanasius the Apostolic, was a Christian theologian and the 20th patriarch of Alexandria (as Athanasius I).

1597–1648 · Reformation

Athanasius of Brest (Russian: Афанасий Брестский, Belarusian: Афанасій Брэсцкі) (died September 5, 1648) is a saint and hieromartyr of the Russian Orthodox Church and the Polish Orthodox Church. He was killed by Catholics for opposition to the Union of Brest.

801–926 · Medieval

Athelm (or Æthelhelm; died 8 January 926) was an English churchman, who was the first Bishop of Wells, and later Archbishop of Canterbury. His translation, or moving from one bishopric to another, was a precedent for later translations of ecclesiastics, because prior to this time…

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Athenagoras was an Ante-Nicene Church Father, a Christian apologist who lived during the second half of the 2nd century of whom little is known for certain, besides that he was Athenian (though possibly not originally from Athens), a philosopher, and a convert to Christianity.

600–600 · Medieval

Athracht (Modern Irish Naomh Athracht; in Latin sources Attracta) is the patron saint of the parish of Locha Techet (Lough Gara) and Tourlestrane, County Sligo, Ireland. She was a sister of Bishop Conal of Drumconnell. Her feast day is 11 August.

501–627 · Medieval

Attala or Atala (died 622) was a disciple of Columbanus and his successor as abbot of Bobbio from 615. Attala was originally from Burgundy, and first became a monk at the abbey of Lérins.

850–919 · Medieval · Benedictines

Attilanus (Atilanus, Aragonese: Sant Atilano) (937–1007) was an Aragonese Benedictine and bishop of Zamora. He was prior of Moreruela Abbey. Saint Atilan (Attilanus), bishop of Zamora (Oct. 5, 10th century).

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Attilio, one of the legendary martyrs of the Theban Legion, is venerated as a saint in the area of Trino Vercellese, in Piedmont, north-west Italy and commemorated on 28 June.

660–725 · Medieval

Saint Aubert, also known as Saint Autbert, was bishop of Avranches in the 8th century and is credited with founding Mont Saint-Michel. Aubert lived in France during the reign of Childebert III (695-711) and died about 720.

600–669 · Medieval

Aubert of Cambrai (French: Aubert de Cambrai) or Aubertus was a Merovingian Bishop of Cambrai and Arras and a Frankish saint. Aubert of Cambrai was born around c. 600 AD in Austrasia, Francia.

609–686 · Medieval

Audoin (Latin: Audoenus; AD 609 – on 24 August 684), venerated as Saint Audoin, was a Frankish bishop, courtier, hagiographer and saint. He authored Vita Sancti Eligii which outlines the life and deeds of Eligius, his close friend and companion in the royal court and the Church.

595–670 · Medieval · Benedictines

Audomar (died c. 670), better known as Omer, was a bishop of Thérouanne, after whom nearby Saint-Omer in northern France was named. He is venerated as a saint in the Catholic and Eastern Orthodox churches.

200–259 · Early Church

Augurius of Tarragona or Saint Augurius  (died 259) was a Christian Hispano-Roman clergyman. It is also cited as Augurinus. Exerting the office of deacon was martyred along with bishop Fructuosus and deacon Eulogius.

1871–1938 · Contemporary

Saint Augusta or St. Augusta, formerly named Ventura, is a city in Stearns County, Minnesota, United States, directly south of the city of St. Cloud. The population was 3,497 at the 2020 census. St. Augusta is part of the Saint Cloud Metropolitan Statistical Area.

410–500 · Medieval

Saint Augusta of Treviso, also known as Augusta of Ceneda, Augusta of Tarvisium, or Augusta of Serravalle, is venerated as a virgin martyr. Her Acts were written in the 16th century by Minuccio Minucci di Serravalle, who was secretary to Pope Clement VIII and Protonotary apostol…

1814–1856 · Modern

Auguste Chapdelaine, Chinese name Mǎ Lài (Chinese: 馬賴; 6 February 1814 – 29 February 1856) was a French Christian missionary of the Paris Foreign Missions Society.

1822–1851 · Modern

Augustin Schoeffler (22 November 1822–1 May 1851) was a French saint and martyr in the Catholic Church and a member of the Paris Foreign Missions Society. He was a priest in Lorraine who joined the Foreign Missions of Paris.

1450–1535 · Reformation · Carthusian Order

Augustine Webster, O.Cart (died 4 May 1535) was an English Catholic martyr. He was the prior of Our Lady of Melwood, a Carthusian house at Epworth, on the Isle of Axholme, in north Lincolnshire, in 1531. His feast day is 4 May.

1746–1815 · Modern

Augustine Zhao Rong (Chinese name: 趙榮; 赵荣; Zhào Róng; 1746–1815) was a Chinese Catholic priest who was martyred in 1815. He was canonized by Pope John Paul II on October 1, 2000, as one of the 120 Martyrs of China. He was born in 1746 in Wuchuan county of Guizhou.

573–603 · Medieval

Saint Aunarius (Aunacharius) (French: Aunaire, Aunachaire, Anachaire) (c.540 – c. 603 AD) was bishop of Auxerre during the 6th century. Born in Orleans of noble birth, he was brought up in the royal court of Guntram.

810–856 · Medieval

Aurea of Córdoba (810–856) was a saint, nun, and martyr, part of the Martyrs of Córdoba, a group of 48 Christian martyrs executed during Muslim rule in al-Andalus. Aurea's feast day is 19 July.

250–250 · Early Church

Aurea of Ostia (or Aura; in Greek, Chryse; both names mean “golden girl”) is venerated as the patron saint of Ostia. She was martyred sometime during the mid-third century, either during the reign of Roman Emperor Claudius Gothicus or Trebonianus Gallus.

1027 · Medieval

Saint Aurelia of Regensburg (died 1027), also known as Aurelia of Ratisbon, is an 11th-century Roman Catholic German saint. According to local tradition, Aurelia was a daughter of Hugh Capet, the first King of the Franks.

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Saint Aurelia of Strasbourg was a 4th-century saint, whose tomb in Strasbourg became the centre of a popular cult in the Middle Ages. According to the legend, Aurelia accompanied Saint Ursula and the eleven thousand virgins from Roman Britain to Cologne, where they were favourab…

200–251 · Early Church

Aurelianus (523 – 551) was Archbishop of Arles from 546 to 551. His predecessors were Auxanius (bishop form 542–546) and Caesarius of Arles (d. 542). His father Sacerdos (d. 552) was an Archbishop of Lyon. His cousin Nicetius (d. 573) succeeded his father as Archbishop of Lyon.

523–551 · Medieval

Aurelianus (523 – 551) was Archbishop of Arles from 546 to 551. His predecessors were Auxanius (bishop form 542–546) and Caesarius of Arles (d. 542). His father Sacerdos (d. 552) was an Archbishop of Lyon. His cousin Nicetius (d. 573) succeeded his father as Archbishop of Lyon.

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Saint Aurelian of Limoges (French: Saint Aurélien) is venerated as a Christian saint. Christian tradition makes him the second bishop of Limoges, and the successor of St. Martial.