What major event influenced the introduction of Christianity in Russia?

The introduction of Christianity in Russia was significantly influenced by Christianization from Constantinople, which is rooted in the Byzantine Empire's role in spreading the faith. This process began in earnest in the 9th century, particularly with the baptism of Grand Prince Vladimir of Kiev in 988. Vladimir adopted Christianity for himself and his realm, leading to a widespread conversion of the Kievan Rus' people. The establishment of the Orthodox Church in Russia was profoundly shaped by the traditions and practices sourced from Constantinople, as Russian Christianity was initially viewed as an extension of Byzantine Christianity.

The other events mentioned, while historically significant, do not have a direct connection to the introduction of Christianity in Russia. The fall of Constantinople in 1453 marks a pivotal moment in history but occurs long after the initial introduction of Christianity to the region. The Norman Conquest pertains to events in England and does not impact Russia directly. The Treaty of Versailles, a peace treaty following World War I, is unrelated to religious developments in Russia. Hence, the connection to Christianization from Constantinople is the most relevant and accurate factor influencing Christianity's introduction in Russia.