The Church inherited and used the Roman legal system.
As the number of Christians increased, the bishops delegated the authority to administer the sacraments: to priests. - Over time, the Bishop of Rome, whom we refer to today as the head of the Western Roman Catholic Church, gradually assumed primary authority over all the churches in the West.
The Vatican's history as the seat of the Catholic Church began with the construction of a basilica over the tomb of St. Peter in Rome in the 4th century A.D. The area developed into a popular pilgrimage site and commercial district, although it was abandoned after the move.
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