Final answer:
The conversion process to Christianity involved various religious groups, including the Germanic invaders, the Slavic peoples, and the barbarian peoples and kingdoms. The Bulgars willingly converted to Christianity to improve political relationships and engage in trade and diplomatic relations. Conversion to Christianity also occurred through missionary work and the efforts of Christian leaders.
Step-by-step explanation:
The conversion process to Christianity involved various religious groups. Some of the groups that were involved in the conversion process included the Germanic invaders, the Slavic peoples, and the barbarian peoples and kingdoms.
An example of a religious group that willingly converted to Christianity was the Bulgars. Despite their military strength and occupation of Byzantine territory, Boris I chose to convert to Christianity and insisted that his followers do the same. This conversion was driven by the desire to improve political relationships and engage in trade and diplomatic relations with Byzantium and other Christian kingdoms.
Conversion to Christianity also occurred through missionary work and the efforts of Christian leaders to spread their faith. The Roman Emperor Constantine's conversion to Christianity linked secular power to Christian identity, leading to the influx of Roman elites converting to Christianity to maintain favor with the emperor.