The early Church emerged in the 1st century AD, rooted in Judaism and shaped by the Roman Empire. Key figures like Paul, Ignatius, and Athanasius spread Christianity and developed its theology, facing persecution and debates over Christ's nature and the Trinity. Early Christian practices included baptism, Eucharist, and charity. The Church grew rapidly, establishing a canon of Scripture and creeds. Its legacy profoundly influenced Western civilization, shaping theology, social institutions, and the relationship between faith and reason.