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Christianity in the 2nd century

Christianity in the 2nd century was largely the time of the Apostolic Fathers who were the students of the apostles of Jesus, though there is some overlap as John the Apostle may have survived into the 2nd century and Clement of Rome is said to have died at the end of the 1st century. While the Christian church was centered in Jerusalem in the 1st century, it became decentralized in the 2nd century. The 2nd century was also the time of several people who were later declared to be major heretics, such as Marcion, Valentinius, and Montanus.

Although the use of the term Christian is attested in the book of Acts from the middle of the first century, the earliest recorded use of the term Christianity (Greek: Χριστιανισμός) is by Ignatius of Antioch about 107 AD, who is also associated with modification of the sabbath, promotion of the bishop, and critique of the Judaizers.