Christianity in the 1st century deals with the formative years of the Early Christian community. The earliest followers of Jesus were a Jewish sect, which historians refer to as Jewish Christianity. The split of early Christianity from Judaism was gradual, as Christianity became a predominantly Gentile religion.
The apostles dispersed from Jerusalem, founding the apostolic sees, presumably following the Great Commission's decree to spread the teachings of Jesus to "all nations". Peter, Paul, and James the Just were the most influential early Christian leaders, although Paul's influence on Christian thinking is said to be more significant than any other New Testament author.
Portals: Christianity Bible
According to the accounts in the Gospels, after being baptized by John the Baptist, Jesus preached for a period of one to three years. Jesus' method of teaching involved parables, metaphor, allegory, sayings, proverbs, and a small number of direct sermons such as the Sermon on the Mount. His ministry was ended by his execution by crucifixion at the hands of the Roman authorities by demand of the Jews in Jerusalem.
Christians believe that three days after his death, Jesus rose bodily from the dead. Early works by Jesus' followers document a number of post-resurrection appearances and the resurrection of Jesus formed the basis and impetus of the Christian faith. His followers wrote that he appeared to the disciples in Galilee and Jerusalem and that Jesus was on the earth for 40 days before his ascension to heaven.
The main sources of information regarding Jesus' life and teachings are the four canonical gospels, and to a lesser extent the Acts of the Apostles and the Pauline epistles.