The earliest Christian mission, the Great Commission and Dispersion of the Apostles, was active within Second Temple Judaism. Whether a Jewish proselytism existed or not that would have served as a model for the early Christians is unclear; see Circumcision controversy in early Christianity#Background for details. Soon, the expansion of the Christian mission beyond Judaism to those who were not Jewish became a contested issue, notably at the Council of Jerusalem. The Apostle Paul was an early proponent of this expansion, and contextualized the Christian message for the Greek and Roman cultures, allowing it to reach beyond its Hebrew and Jewish roots.

From Late Antiquity onward, much missionary activity was carried out by members of religious orders. Monasteries followed disciplines and supported missions, libraries, and practical research, all of which were perceived as works to reduce human misery and suffering and glorify the Christian God. For example, Nestorian communities evangelized parts of Central Asia, as well as Tibet, China, and India.[4] Cistercians evangelized much of Northern Europe, as well as developing most of European agriculture's classic techniques. St Patrick evangelized many in Ireland. St David was active in Wales. 

https://image.nostr.build/6622cb9b607be86b7efecf010ec86aaf19fe00a8c5501bf89754725bd540c59c.png