Zosimus the Hermit was an ascetic who resided in the wilds of Cilicia

Cilicia

In antiquity, Cilicia was the south coastal region of Asia Minor, south of the central Anatolian plateau. It existed as a political entity from Hittite times into the Byzantine empire...

 in the third century AD.

Zosimus was torture

Torture

Torture is the act of inflicting severe pain as a means of punishment, revenge, forcing information or a confession, or simply as an act of cruelty. Throughout history, torture has often been used as a method of political re-education, interrogation, punishment, and coercion...

d during the persecution of the Church under Roman Emperor

Roman Emperor

The Roman emperor was the ruler of the Roman State during the imperial period . The Romans had no single term for the office although at any given time, a given title was associated with the emperor...

 Diocletian

Diocletian

Diocletian |latinized]] upon his accession to Diocletian . c. 22 December 244  – 3 December 311), was a Roman Emperor from 284 to 305....

 but persevered in his Christian

Christian

A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 faith. After being tortured he was supposedly left miraculously unharmed which led to the conversion of Zosimus' guard Athanasius who accepted the Christian faith and baptism

Baptism

In Christianity, baptism is for the majority the rite of admission , almost invariably with the use of water, into the Christian Church generally and also membership of a particular church tradition...

.

Eventually both Zosimus and Athanasius were released and lived out the rest of their lives in a mountain hermitage

Hermitage (religious retreat)

Although today's meaning is usually a place where a hermit lives in seclusion from the world, hermitage was more commonly used to mean a settlement where a person or a group of people lived religiously, in seclusion.-Western Christian Tradition:...

 far from human society.

Saint Zosimus the Hermit

Hermit

A hermit is a person who lives, to some degree, in seclusion from society.In Christianity, the term was originally applied to a Christian who lives the eremitic life out of a religious conviction, namely the Desert Theology of the Old Testament .In the...

 and Saint Athanasius his disciple

Disciple (Christianity)

In Christianity, the disciples were the students of Jesus during his ministry. While Jesus attracted a large following, the term disciple is commonly used to refer specifically to "the Twelve", an inner circle of men whose number perhaps represented the twelve tribes of Israel...

 are commemorated on 4 January by the Eastern Orthodox and Byzantine Catholic Churches.