The Roman Empire played a crucial role in the spread of Christianity, mainly from the 1st to the 4th centuries CE. Initially, Christianity emerged as a sect within Judaism in Judea but gained traction throughout the empire due to its universal message and appeal to marginalized populations. The extensive network of Roman roads facilitated missionaries, like Paul of Tarsus, who traveled extensively to spread Christian teachings. Additionally, the Edict of Milan in 313 CE, issued by Emperor Constantine, granted religious tolerance and helped Christianity transition from a persecuted faith to the state religion, significantly influencing Western culture.