King Jinsa of Baekje (?-392, reigned 385-392) was the 16th king of the ancient Korean kingdom of Baekje, one of the Three Kingdoms of Korea. He was the younger brother of the previous ruler, King Chimnyu. According to the Goryeo chronicle Samguk Sagi, he ascended to the throne because the heir, later King Asin, was too young. However, according to the Japanese Nihonshoki he usurped the throne by force.
He ordered numerous attacks against Goguryeo, which was expanding into Baekje territory from the north. In the year 386, he commanded all men living in Cheongmongnyeong (present-day Kaesong), above the age of 15, to move north and west to defend the borders. He sent the noble Jin Gamo to attack the Goguryeo Dogon Castle , which was conquered. However, in 392 King Gwanggaeto of Goguryeo counterattacked and seized most Baekje territory north of the Han River. In the 10th month of that year, Goguryeo troops took Gwanmi Castle and threatened the Baekje palace.
According to the Samguk Sagi, King Jinsa died of disease in a temporary palace after retreating from the Goguryeo advance. According to the Nihonshoki, he was removed through the influence of King Asin.
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