King Geunchogo's Conquest of Mahan and Baekje at Its Height
In 369, King Geunchogo conquered the remaining Mahan polities and expanded Baekje's territory southward, ushering in the kingdom's greatest era of prosperity. Then in 371, he attacked Pyeongyang Fortress together with the crown prince and killed King Gogukwon of Goguryeo in battle.
Key developments
- 마한 정복Conquest of Remaining Mahan Territories
King Geunchogo conquered the remaining Mahan territories, securing full control over the southwestern Korean peninsula.
- 요서 진출Alleged advance into Liaoxi
Baekje is said to have extended into the Liaoxi region of China and played an active role in East Asian trade networks, though this Liaoxi-advance theory remains debated among historians.
- 고구려 공격Battle of Pyongyang and Death of King Gogugwon
King Geunchogo attacked Goguryeo and killed King Gogugwon at the Battle of Pyongyang, dealing a severe blow to Goguryeo.
- 동진 교류Diplomatic Relations with Eastern Jin and Japan
King Geunchogo established diplomatic ties with Eastern Jin China and sent the Seven-Branched Sword to Japan, fostering international exchange.