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Daniel the Prophet(c. 615–515 B.C.) An Old Testament prophet known for surviving being thrown into a den of lions and for interpreting dreams. His prophetic writings ... more
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PythagorasPythagoras (c. 570–495 B.C.) was a Greek philosopher who is credited with many mathematical and scientific discoveries. He also promulgated mystical... more
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Alexander the GreatAlexander the Great (356–323 B.C.) was King of Macedon and went on to create one of the largest empires of the ancient world by the time he was thir... more
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Antiochus IV(c. 215–164 B.C.) Antiochus IV was king of the Seleucid Empire. He essentially conquered Egypt but backed off in the face of pressure from Rome. Dur... more
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Paul the Apostle(c. 4 B.C.–A.D. 64) Apostle and early Christian missionary, whose letters are the earliest documents contained in the New Testament and thus the fir... more
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John the BaptistJohn the Baptist (c. 1 B.C.–c. A.D. 30) was a Jewish preacher and prophet, Jesus’s cousin, he taught salvation through a coming messiah, and he us... more
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John the ApostleJohn (c. A.D. 6–100) was a Jewish fisherman, chosen by Jesus to be one of his 12 Apostles, and appears to have developed an especially close bond wi... more
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Clement of Rome(c. A.D. 35–99) He was bishop of Rome from around AD 88 to his death in AD 99. His is one of the few Church fathers who lived during the time of the... more
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Ignatius of Antioch(c. A.D. 35–108) Also known as Ignatius Theophorus, was the second bishop of Antioch who wrote a series of letter to other bishops while he was in t... more
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Valentinus(c. A.D. 100–175) Author of an influential and philosophically sophisticated version of Gnosticism. He was active in Rome in the 140s, and even hope... more
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Justin Martyr(c.A.D 100–165) Born in Palestine early in the 2nd century, Justin was educated as a philosopher and converted to Christianity, retaining many of hi... more
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Marcus Aurelius(A.D. 121–180) Marcus Aurelius was Roman Emperor from A.D. 161 until his death in 180. He was renowned for his philosophical thinking and temperance... more
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Clement of Alexandria(c. A.D. 150–215) Titus Flavius Clemens, now known as Clement of Alexandria, was an early Christian theologian whose theology was heavily influenced... more
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Tertullian(c. A.D. 160–225) North African priest and theologian, the first major Latin Christian author. Despite the large number of his writings that have su... more
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DiocletianDiocletian (A.D. 244–311) was a Roman Emperor who successfully stabilized the Roman Empire after nearly collapsing after a period of invasion, civil... more
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Lactantius(c. A.D. 250–325) Lactantius was a Christian advisor to Emperor Constantine regarding religious policies. He was also the tutor of Constantine’s s... more
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Stephen Bishop of Rome(Died A.D. 257) Stephen was Bishop of Rome and Pope from A.D. 254 to 257. He addressed issues relating to the reintegration of members and leaders who... more
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Eusebius of Caesarea(A.D. 263–May 339) Eusebius became bishop of Caesarea around A.D. 314 and became one of early Christianity’s foremost scholars, apologist, and His... more
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ConstantineConstantine I (c. A.D. 272–337) was a Western Roman Emperor who, after a series of civil wars, became emperor of the entire Roman Empire. He strengt... more
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Felix Bishop of Rome(Died A.D. 274) Felix was Bishop of Rome and Pope from A.D. 269 until his death in 274. He condemned the teaching that Christ was born as a mere morta... more
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Athanasius(c. A.D. 296–373) Athanasius was a Bishop of Alexandria and was a leading proponent of orthodox trinitarianism in opposition to Arianism. His positi... more
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Ezana of Axum(4th Century A.D.) Ezana was taught by a Christian monk as a child and converted to Christianity. When he became King of Axum (modern day Ethiopia) in... more
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ValentinianValentinian (A.D. 321–375) is often considered the last great emperor of the Western Roman Empire. He established security through a series of succe... more
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Gregory of Naziansen(c. A.D. 330–390) Sometimes known as Gregory of Naziansen, one of the Cappadocian Fathers. Among the Eastern Orthodox he is called “Saint Gregory ... more
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Gregory of Nyssa(c. A.D. 335–394) One of the Cappadocian fathers, brother of Basil of Caesarea, and author of important works on the Trinity, including a brief but ... more
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Eusebius of Nicomedia(Died A.D. 341) Eusebius was a contemporary and supporter of Arius and became Bishop of Nicomedia in present-day Turkey. Eusebius exercised tremendous... more
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TheodosiusTheodosius (A.D. 347–395) was Roman Emperor from A.D. 379 until his death. He was the last emperor to rule over a united Roman Empire, his two sons ... more
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Theodore of Mopsuestia(c. A.D. 350–428) Theodore was Bishop of Mopsuestia, located on the southeastern coast of Asia Minor, from A.D. 392 until his death. He was a major ... more
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Valentinian II(A.D. 371-392) Valentinian II was Emperor in the Western Roman Empire from A.D. 375 until 392. He was essentially a figurehead for other dominant and ... more
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Socrates the Historian(c. A.D. 380–439) Socrates was a Christian historian who wrote a history of Christianity covering the years A.D. 305–439. His history was generall... more
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Apollinaris of Laodicea(Died A.D. 382) Apollinaris was Bishop of Laodicea in Syria. He was an opponent of Arianism whose Christological views were also declared heretical at... more
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Theodosius IITheodosius II (A.D. 401–450) was an Eastern Roman Emperor, and he best known for commissioning a compilation of the laws in a single code, primarily... more
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Eusebius Bishop of Dorylaeum(5th century A.D.) Eusebius was the Bishop of Dorylaeum, a community in present-day Turkey. He was a player in the Christological disputes of the time... more
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Dioscorus of Alexandria(Died A.D. 454) Dioscorus was the last Pope and Patriarch of Alexandria to attend a Western council, the Council at Chalcedon. There, he was deposed f... more
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Leo the Great(Died A.D. 10 Nov 461) Leo I became pope in A.D. 440 and was instrumental in establishing the duel nature of Christ through the “Tome of Leo” as t... more
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Isidore of Seville(c. A.D. 560–636) Isidore of Seville was the Archbishop of Seville and is often considered the last scholar of the ancient world. He played a critic... more
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Maximus the Confessor(c. A.D. 580–662) Maximus the Confessor was a Christian monk and theologian based in Constantinople. Maximus featured prominently in the Christologi... more
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Maxiumus the Confessor
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Gregory the Great(died A.D. 12 Mar 604) Gregory I became pope in 590 and earned the designation “great” due to his insistence of the authority of the papacy and th... more
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Charles MartelCharles Martel (c. A.D. 688–741) became the power behind the throne of the Merovingian dynasty. He saved western Christianity by defeating Islamic i... more
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CharlemagneCharlemagne (c. A.D. 742–814) was the eldest son of Pepin, who became sole ruler of the Franks upon the death of his younger brother Carloman. Charl... more
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Nicholas I(c. A.D. 800–867) Stressed the supremacy of the Pope in both ecclesiastical and royal matters, relying for the first time on the False Decretals inc... more
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Cyril of Thessalonica(c. A.D. 826–869) Cyril of Thessalonica was a Byzantine Christian theologian and missionary to the Slavic people. He was critical in developing the ... more
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Alfred the GreatAlfred the Great (c. A.D. 847–899) was King of Wessex who, in the face of Viking invasions of the British Isles, became the first King of the Anglo-... more
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Adrian III(Died. A.D. 885) Adrian III was Pope from 884 until his death in 885. He worked to alleviate the suffering of the people in Italy during a period of f... more
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Vladimir I(c. A.D. 956–1015) Vladimir I also known as Vladimir the Great was the Rus leader in Kiev whose conversion to Christianity established Christianity... more
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Michael Cerularius(c. A.D. 1000–1059) Michael Cerularius was born in Constantinople and became the Patriarch of Constantinople in A.D. 1043. He disputed with Pope Leo... more
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Gregory VII(c. A.D. 1015–1085) Gregory VII was Bishop of Rome and Pope from A.D. 1073 until his death in 1085. Pope Gregory VII successfully asserted the Papal... more
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Bernard of ClairvauxBernard of Clairvaux (A.D. 1090–1153) reformed Medieval monasticism, forming the Cistercian Order. He was critical in establishing Innocent II as po... more
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Arnold of Brescia(c. A.D. 1090–1155) Arnold was an Italian priest who sought to have the Church renounce property ownership and participated in a failed attempt to r... more
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Peter LombardPeter Lombard (c. A.D. 1096–1160) was a prominent theologian who briefly became Bishop of Paris before his death. Lombard’s magnum opus, Four Book... more
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Peter of Bruys(Died c. A.D. 1131) Peter of Bruys was a leader of a movement in France which rejected infant baptism, the building of churches, the use of the cross,... more
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MaimonidesMaimonides (c. A.D. 1135–1204) was a Jewish philosopher from Cordoba under the Islamic Almoravid Empire. His work on the Talmud was considered persu... more
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Peter Waldo(c. A.D. 1140–1205) Peter Waldo was the leader of a medieval Christian spiritual movement known as the Waldensians. Waldo advocated for simplicity a... more
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Innocent III(c. A.D. 1160–1216) Innocent III was Pope from A.D. 1198 until his death in 1216. He was one of the most influential Popes in Medieval Europe. He us... more
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Francis of AssisiFrancis of Assisi (c. A.D. 1181–1226) was born to a wealthy Italian merchant and French noblewoman. Francis’s youth was typical for his time and c... more
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Innocent IV(c. A.D. 1195–1254) Innocent IV was Pope from A.D. 1243 until his death in 1254. In the First Council of Lyons, Innocent IV had the Holy Roman Emper... more
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Thomas Aquinas(c. A.D. 1225-1274) Dominican friar, teacher at the University of Paris, central figure of medieval scholasticism, and the most authoritative theologi... more
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Boniface VIII(c. A.D. 1230–1303) Boniface VIII was Pope from A.D. 1294 until his death in 1303. He became Pope upon the resignation of Pope Celestine V, which ca... more
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Duns ScotusJohn Duns Scotus (c. A.D. 1266–1308) was a Scottish theologian and scholastic who is considered one of the most important theologians of the Middle ... more
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Marsilius of Padua(c. A.D. 1275–1342) Marsilius wrote the political treatise Defensor pacis in 1324 which contested Papal claims to political power and laid the found... more
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William of OckhamWilliam of Ockham (c. A.D. 1287–1347) was an English Friar, theologian, and scholastic. He is best known for the logical principle, Occam’s Razor ... more
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