The Christianized Romans had no desire to spread Christianity beyond the borders of the empire. Around the time the Roman Empire collapsed, monks and missionaries began working to spread Christianity throughout Europe.
Christianity was slow to spread to different locations across Europe. The local people did not immediately embrace Christianity. It first gained converts mainly in the cities. Christianity then spread to wealthy landowners followed by their rural tenant farmers.
Missionaries focused their activities on political leaders and noblemen. They believed that if a leader converted to Christianity, their people would follow. Several European queens converted to Christianity and then converted their pagan king husbands as well.
Some early followers converted to Christianity yet still worshiped their pagan gods.
Source: Spread of Christianity in Europe
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