Three Kingdoms of Korea

The Three Kingdoms of Korea were Goguryeo, Baekje and Silla. They existed between the 1st century BC and 7th century CE. There were some smaller kingdoms like Gaya, Dongye, Okjeo, Buyeo, Usan, Tamna, etc.

Three Kingdoms of Korea
Map of the Three Kingdoms of Korea—Goguryeo, Baekje, and Silla—in the fifth century, at the height of Goguryeo's territorial expansion
Korean name
Hunminjeongeum	삼국시대
Hanja	三國時代
Revised Romanization	Samguk-sidae
McCune–Reischauer	Samguk-sidae
Other name
Hunminjeongeum	삼국시기
Hanja	三國時期
Revised Romanization	Samguk-sigi
McCune–Reischauer	Samguk-sigi

Baekje helped spread Chinese characters, Chinese culture, Han Buddhism, and other technology to Japan.

The Three Kingdoms period ended in 668: Silla allied with the Tang Dynasty to conquer Baekje and then Goguryeo. Korea unified under Later Silla. The Tang occupied the northern parts of Korea. After this Korea split during the North and South States period.

Besides Chinese records, the books Samguk Sagi and Samguk Yusa also record the history of the era. "Samguk" (Hangul: 삼국, Hanja: 三國) means "Three Kingdoms".