Who was Justin Martyr?Justin Martyr was an early Christian apologist, and is regarded as the foremost interpreter of the theory of the Logos in the 2nd century. He was martyred, alongside some of his students, and is considered a saint by the Roman Catholic Church, the Anglican Church, the Eastern Orthodox Church, and the Oriental Orthodox Churches.
Who was Tertullian?Tertullian (155-240 AD) was a prolific early Christian author from Carthage in the Roman province of Africa. Of Berber origin, he was the first Christian author to produce an extensive corpus of Latin Christian literature. He also was an early Christian apologist and a polemicist against heresy, including contemporary Christian Gnosticism. Tertullian has been called "the father of Latin Christianity" and "the founder of Western theology." Though conservative in his worldview, Tertullian originated new theological concepts and advanced the development of early Church doctrine. He is perhaps most famous for the term trinity (Latin: trinitas). According to The Stanford Encyclopedia of Philosophy, "Tertullian's trinity [is] not a triune God, but rather a triad or group of three, with God as the founding member".
Who was Ignatius?Ignatius of Antioch (35-107 AD) was an early Christian writer and bishop of Antioch. En route to Rome, where he met his martyrdom, Ignatius wrote a series of letters. This correspondence now forms a central part of the later collection known as the Apostolic Fathers, of which he is considered one of the three chief ones together with Pope Clement I and Polycarp.
Who was Irenaeus?Irenaeus (130-202 AD) was a Greek bishop. He is noted for his role in guiding and expanding Christian communities in what is now the south of France and, more widely, for the development of Christian theology by combating heresy and defining orthodoxy. Originating from Smyrna, now Izmir in Turkey, he had heard the preaching of Polycarp, who in turn was said to have heard John the Evangelist.
Who was Polycarp?Polycarp (69-155 AD) was a 2nd-century Christian bishop of Smyrna. According to the Martyrdom of Polycarp he died a martyr, bound and burned at the stake, then stabbed when the fire failed to touch him. Polycarp is regarded as a saint and Church Father in the Eastern Orthodox, Oriental Orthodox, Catholic, Anglican, and Lutheran churches.
What is Trinity?The Christian doctrine of the Trinity (Latin: trinus "threefold") holds that God is one God, but three coeternal consubstantial persons or hypostases. These being the Father, the Son (Jesus Christ), and the Holy Spirit - as "one God in three Divine Persons". The three Persons are distinct, yet are one "substance, essence or nature" (homoousios).
Who was Origen?Origen of Alexandria (184-253 AD) was an early Christian scholar, ascetic, and theologian. He who was born and spent the first half of his career in Alexandria. He was a prolific writer who wrote roughly 2,000 treatises in multiple branches of theology, including textual criticism, biblical exegesis and biblical hermeneutics, homiletics, and spirituality. He was one of the most influential figures in early Christian theology, apologetics, and asceticism. He has been described as "the greatest genius the early church ever produced".