Final answer:
Christianity spread throughout Byzantium, Axum, and Western Europe through religious missions, political influence, and cultural assimilation, with key figures like Frumentius in Axum and the Frankish kingdom in Europe.
Step-by-step explanation:
Christianity spread in Byzantium, Axum, and Western Europe due to a complex mix of religious perseverance by missionaries, political motivations, and cultural adaptation.
Byzantine Empire was central to the spread of Christianity in the eastern Mediterranean regions, using Greek language and Christian teachings as part of its cultural expansion.
In Axum, now known as Ethiopia, Christianity was introduced by a Syrian teacher named Frumentius, whose evangelizing efforts, along with other missionaries, helped in translating biblical teachings into the local language, Ge'ez, thus rooting the religion deeply in the region.
In Western Europe, Christianity's spread can be attributed to the resilient efforts of missionaries, political alliances, and the often strategic adaptation of local pagan practices into Christian customs.
For example, the Frankish kingdoms played a significant role in the establishment and spread of Christianity throughout Europe.