Christianity may have begun as a small group of a few dozen followers of Jesus, but it grew at a steady clip for the next two centuries. By the late 3rd century AD this growth had exploded into a major religion within the Roman Empire. Many members of the upper classes had converted, especially women. Christians served in the army and held positions in the civil service. Christian churches were organized throughout much of the empire, with bishops in major cities and pastors leading local congregations throughout towns and villages. Churches were built in most cities as Christians moved out of meeting in private houses to create their own places of worship.
Meanwhile, the Roman Empire was falling apart in fifty years of unrest known as the Third Century Crisis. The prosperous, largely peaceful empire of the Severan Emperors gave way to constantly changing governments, weak emperors and numerous military coups. Foreign invasions threatened all of the borders of the empire and some regions of the empire sought to secede and break away. The protracted unrest caused the economy to take a nose dive. The government sought to address the problem of low tax revenues by devaluing its currency, which made the problem worse. Poverty caused many people to leave cities and become semi-serfs, working land owned by large landowners.