The rise of Christianity began in the 1st century CE, rooted in the teachings of Jesus of Nazareth, a Jewish preacher. His followers, known as disciples, spread his message throughout the Roman Empire, emphasizing love, forgiveness, and salvation. The early Christians faced persecution but continued to grow in numbers and influence. By the 4th century, Christianity gained significant traction, especially after Emperor Constantine converted and issued the Edict of Milan in 313 CE, granting religious tolerance. This led to the establishment of Christianity as a dominant religion in the empire, culminating in the Council of Nicaea in 325 CE, which unified Christian doctrine.