This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Buddhism reaches Korea in 372 CE, when the Former Qin ruler Fu Jian sent the Chinese monk Sundo to the court of King Sosurim of Goguryeo, carrying Buddhist texts and images. The Goguryeo court accepted his teaching, and within a few years Seongmunsa temple was built for him, the beginning of Buddhist temple construction anywhere on the Korean peninsula.
The introduction carried a strategic purpose alongside its religious one, strengthening ties between Former Qin and Goguryeo against shared regional threats, a reminder that royal patronage and royal politics moved together throughout Buddhism's spread across East Asia. Goguryeo's own territory lay in the northern peninsula and Manchuria, not within the modern southern state, so this event is anchored to Korea, the nearest real place on record for a kingdom whose own borders no longer match any single country today.
What changed for the tradition's spread is a durable foothold on the peninsula from which it would continue outward: Buddhism reached the neighboring kingdom of Baekje in 384 CE and Silla by the 530s, each on its own separate mission, and it was Baekje's own court that would later carry the teaching onward again, across the sea to Japan.