The term Early Christianity here refers to Christianity of the period after the Death of Jesus in the early 30s and before the First Council of Nicaea in 325. The term is sometimes used in a narrower sense of just the very first followers (disciples) of Jesus of Nazareth and the faith as preached and practiced by the Twelve Apostles, their contemporaries, and their immediate successors, also called the Apostolic Age.Early Christianity, which began within Judaism, became clearly distinct from Rabbinic Judaism. It continued to revere the Hebrew Bible, generally using the Septuagint translation that was in general use among Greek-speaking Jews and Gentile Godfearers, and added to it the writings that would become the New Testament, thus developing the first Christian biblical canons. It defended Christian beliefs against criticism by non-believing Jews and followers of other Roman religions, survived various persecutions, consisted of divisions that accused each other of heresy, and developed church hierarchy.
What started as a religious movement within Second Temple Judaism became, by the end of this period, the favored religion of the Roman Empire under Constantine the Great (leading later to the rise of Christendom), and a significant religion also outside of the empire. The First Council of Nicaea marks the end of this era and the beginning of the period of the first Seven Ecumenical Councils (325 - 787).
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