Nazarenes
The term Nazarene was applied to Jesus of Nazareth (Gospel of Matthew 2:23). Mention of a "sect of the Nazarenes" (plural) occurs first with Tertullus (Acts 24:5). After Tertullus the name does not appear again, apart from an unclear reference in Eusebius' Onomasticon, until a similar name, "Nazoreans", is distinguished by Epiphanius in his Panarion in the 4th Century.
It was the term used to identify the predominantly Jewish sect that believed Jesus was the Messiah. When this sect branched into the Gentile world, they became known as Christians.
By the 4th century, Nazarenes are generally accepted as being the first Christians that adhered to the Mosaic law who were led by James the Just, the brother of Jesus. Traditionally he led the Church from Jerusalem and according to 1 Corinthians (15:7) had a special appearance of the resurrected Jesus, and only “then to all the apostles”.
Read more about this topic: Gospel Of The Nazarenes, Background