King Dongmyeong of Goguryeo in the context of "Goguryeo"

Paekche or Baekje (Korean: 백제; Hanja: 百濟; RR: Baekje; MR: Paekche; pronounced [pɛk̚.tɕ͈e]) was a Korean kingdom located in southwestern Korea from 18 BCE to 660 CE. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla. While the three kingdoms were in separate existence, Baekje had the highest population of approximately 3,800,000 people (760,000 households), which was much larger than that of Silla (850,000 people) and similar to that of Goguryeo (3,500,000 people).

Baekje was founded by Onjo, the third son of Goguryeo's founder Jumong and Soseono, at Wiryeseong (present-day southern Seoul). Baekje, like Goguryeo, claimed to succeed Buyeo, a state established in present-day Manchuria around the time of Gojoseon's fall.

37°31′50.25″N 127°7′0.62″E / 37.5306250°N 127.1168389°E / 37.5306250; 127.1168389

Wiryeseong (Korean: 위례성; Hanja: 慰禮城) was the name of two early capitals of Baekje, one of the Three Kingdoms of Korea. Both are believed to have been in the modern-day Seoul area. According to the Samguk sagi (the oldest surviving Korean history books, written in the 12th century), Onjo, the son of Goguryeo's founder Jumong, founded the nation of Sipje (십제, 十濟; later became Baekje) on Wiryeseong in 18 BC, while his elder brother Biryu established himself in Michuhol (미추홀; 彌鄒忽) further to the west. The location of Michuhol is usually believed to be present-day Incheon.