Jinsa of Baekje was the 16th king of Baekje

Baekje

Baekje or Paekche was a kingdom located in southwest Korea. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla....

, one of the Three Kingdoms of Korea

Three Kingdoms of Korea

The Three Kingdoms of Korea refer to the ancient Korean kingdoms of Goguryeo, Baekje and Silla, which dominated the Korean peninsula and parts of Manchuria for much of the 1st millennium...

.

He was the younger brother of the previous ruler, King Chimnyu

Chimnyu of Baekje

Chimnyu of Baekje was the 15th king of Baekje, one of the Three Kingdoms of Korea. He was the eldest son of Geungusu of Baekje and Lady Ai. He was the first Baekje king to officially recognize Buddhism....

. According to the Samguk Sagi

Samguk Sagi

Samguk Sagi is a historical record of the Three Kingdoms of Korea: Goguryeo, Baekje and Silla. The Samguk Sagi is written in Classical Chinese and its compilation was ordered by Goryeo's King Injong Samguk Sagi (History of the Three Kingdoms) is a historical record of the Three Kingdoms of...

, he ascended to the throne because the heir, later King Asin

Asin of Baekje

Asin of Baekje was the 17th king of Baekje, one of the Three Kingdoms of Korea.- Background :Buyeo Abang was the eldest son of Baekje's 15th ruler Chimnyu, and ascended to the throne after the death of Chimnyu’s brother, the 16th king Jinsa, of whom he is said to have killed.- Reign :During his...

, was too young. However, according to the Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese Nihon Shoki

Nihon Shoki

The , sometimes translated as The Chronicles of Japan, is the second oldest book of classical Japanese history. It is more elaborate and detailed than the Kojiki, the oldest, and has proven to be an important tool for historians and archaeologists as it includes the most complete extant historical...

he usurped the throne by force.

He ordered numerous attacks against Goguryeo

Goguryeo

Goguryeo or Koguryŏ was an ancient Korean kingdom located in present day northern and central parts of the Korean Peninsula, southern Manchuria, and southern Russian Maritime province....

, which was expanding into Baekje territory from the north. In the year 386, he commanded all men living in Cheongmongnyeong (present-day Kaesong

Kaesong

Kaesŏng is a city in North Hwanghae Province, southern North Korea , a former Directly Governed City, and the capital of Korea during the Koryo Dynasty. The city is near Kaesŏng Industrial Region and it contains the remains of the Manwoldae palace. It was formally named Songdo while it was the...

), above the age of fifteen, 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

Gwanggaeto the Great of Goguryeo

Gwanggaeto the Great of Goguryeo was the nineteenth monarch of Goguryeo, the northernmost of the Three Kingdoms of Korea. His full posthumous name roughly means "Very Greatest King, Broad Expander of Territory, buried in Gukgangsang.", sometimes abbreviated to Hotaewang or Taewang...

 of Goguryeo counterattacked and seized most of the Baekje territory north of the Han River

Han River (Korea)

The Han River is a major river in South Korea and the fourth longest river on the Korean peninsula after the Amnok, Duman, and Nakdong rivers. It is formed by the confluence of the Namhan River , which originates in Mount Daedeok, and the Bukhan River , which originates on the slopes of Mount...

. In the tenth month of that year, Goguryeo troops took Gwanmi Castle and threatened the Baekje palace.

According to the Samguk Sagi, Jinsa died while hunting at a satellite palace in Guwon. According to the Nihon Shoki, he was killed by Asin's supporters.