Saint George was a Christian soldier in the Roman army who is accepted as a saint in Christianity. He was sentenced to death for refusing to recant his Christian faith and was executed by decapitation, according to Greek tradition. Saint George's Day is celebrated in his memory on 23 April. He is one of the most venerated saints in Christianity.
Eusebius of Caesarea was a historian of Christianity and Christian polemicist. He was a bishop of Caesarea Maritima and a scholar of the biblical canon. As "Father of Church History," he wrote the Ecclesiastical History and a biographical work on Constantine the Great, the first Christian emperor. He is regarded as one of the most learned Christians of his time.
Pope Telesphorus served as the bishop of Rome from 126 until his death in 137. He is venerated as a patron saint of the order by the Carmelites. Some sources even portray him as a hermit living on Mount Carmel. Saint-Télesphore, a town in Canada's Quebec province, is named after Pope Telesphorus.
Greek bishop Irenaeus, now revered as a Catholic saint, is remembered for his clashes with the Gnostics and his notable work Adversus haereses. Irenaeus apparently preached about the validity of the Jewish Bible, while the Gnostics were against it. Legend has it that he had seen Polycarp of Smyrna.
Pope Hyginus served as the bishop of Rome from 138 until his death in 142. Hyginus played a crucial role in determining the numerous prerogatives of the clergy during his papacy. He also helped define the various grades of the priestly hierarchy.
Pope Eleutherius, the bishop of Rome for around 15 years from 174 to 189 C.E, is revered as a Saint in the Catholic Church. He is known for his stance against the Montanist movement and the food decree that he issued. Also, as per a legend, it is believed that Lucius, the King of Britain, asked him to send missionaries.
Patriarch Metrophanes of Alexandria was a Greek theologian and monk. Between 1636 and 1639, he was the Greek Patriarch of Alexandria. Metrophanes constructed an important library during his term as patriarch of Alexandria. Patriarch Metrophanes of Alexandria is also credited with educating the West of Orthodoxy and aspired to unify the churches of Western Europe with the Orthodox Church.
Gregory of Sinai was a monk who played a major role in the emergence of Hesychasm in 14th century. He learned the ways of Hesychasm from Arsenios. Gregory of Sinai is also credited with founding a monastery in southeast Bulgaria where he had taken shelter in the Bulgarian Empire in an attempt to escape the increasing Muslim raids on Athos.
Byzantine monk and author Anthony Melissa is best-remembered for his seminal work, Melissa, an anthology, compiled in two books, that is largely based on two prominent sources for Eastern Orthodox spirituality. His teachings and maxims that centred on Holy Scripture and on the works of Christian as well as secular authors fostered a popular Greek Orthodox tradition of moral-ascetical practice.