King Onjo (r. 18 BC - 28 AD) is the legendary founder and first king of the ancient Korean kingdom of Baekje. He is known as the third son of King Dongmyeong, the founder of Goguryeo. King Dongmyeong had three sons; Yuri, Biryu, and Onjo. Afer Yuri, born from King Dongmyeong's first wife in Fuyu, came to Goguryeo and became the heir of throne, Biryu and Onjo left Goguryeo and moved south to found their own kingdoms.
According to the Samguk Yusa, Biryu (비류/沸流) founded his kingdom in Michuhol (미추홀/彌鄒忽), but his didn't last long. The modern-day location of Michuhol is in debate—it was identified as Incheon (a city near Seoul) for a long time, but recently it was suggested as Incheon County, City of Asan, South Chungcheong. Onjo found his kingdom in Wirye, in or near modern-day Seoul, and named it Sipje (십제/十濟). Biryu's people joined Sipje after Biryu's death and King Onjo renamed it to Baekje.
Whether the legend tells the truth or not, it indicates that Buyeo, Jolbon Buyeo (or Goguryeo), and South Buyeo (or Baekje) shared a common origin.
Baekje, as a kingdom, does not appear until 345 CE in Chinese records, although this may be explained by the presence of the expansive and antagonistic Goguryeo kingdom located between the two.
Baekje's diplomatic policy for China was changed after Dongjin was destroyed in 418 CE and the Song Dynasty (a state and dynasty in ancient China) was founded in 420 CE; Baekje sent envoys frequently to Song, receiving official rank, and also asked for all kinds of books and technological expertise.
Hubaekje was overthrown in 936 CE by King Taejo of Goryeo.
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