BaekjeBaekje or Paekche (, pɛk̚.t͈ɕe) was a Korean kingdom located in southwestern Korea from 18 BC to 660 AD. 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 similar to that of Goguryeo (3,500,000 people) and much larger than that of Silla (850,000 people). Baekje was founded by Onjo, the third son of Goguryeo's founder Jumong and Soseono, at Wiryeseong (present-day southern Seoul).
GoguryeoGoguryeo (37 BC–668 AD) (; ko̞ɡuɾjʌ̹; : high castle; Old Korean: Guryeo) also later known as Goryeo (; ko.ɾjʌ; : high and beautiful; Middle Korean: 고ᇢ롕〮, Gowoyeliᴇ), was a Korean kingdom located in the northern and central parts of the Korean Peninsula and the southern and central parts of modern day Northeast China. At its peak of power, Goguryeo controlled most of the Korean Peninsula, large parts of Manchuria and parts of eastern Mongolia and Inner Mongolia as well as Russia.