What year did the early Christian era start?

around the year 27–30

Explanation:

We can fix the first stage in the history of Christianity, as a diverse phenomenon from the preaching of Jesus, around the year 27–30, when the Church is structured around the monarchical bishopric.

During this period, the difference is established between an apostle, an itinerant bishop without a diocese, and a bishop, and an apostolic successor.

the enslavement and death of yeet