North–South States Period
|North–South States Period|
Part of a series on the
|History of Korea|
|Later Three Kingdoms|
|Unitary dynastic period|
|Division of Korea|
After the unification wars, the Tang Dynasty established territories in the former Goguryeo, and began to administer and establish communities in Baekje. Silla attacked the Chinese in Baekje and northern Korea in 671.
The Tang Dynasty then invaded Silla in 674 but Silla defeated the Tang army in the north. Silla drove the Tang forces out of the peninsula by 676 to achieve unification of most of the Three Kingdoms.
Korean arts flourished dramatically and Buddhism became a large part of Silla culture. Buddhist monasteries such as the Bulguksa are examples of advanced Korean architecture and Buddhist influence. State-sponsored art and architecture from this period include Hwangnyongsa Temple, Bunhwangsa Temple, and Seokguram Grotto, a World Heritage Site.
Silla began to experience political troubles in 780. This severely weakened Silla and soon thereafter, descendants of the former Baekje established Later Baekje. In the north, rebels revived Goguryeo, beginning the Later Three Kingdoms period.
Balhae was founded after Goguryeo had fallen. It was founded in the northern part of former lands of Goguryeo by Dae Joyeong, a former Goguryeo general. Balhae controlled the northern areas of the Korean Peninsula, much of Manchuria, and expanded into present-day Russian Maritime Province. Balhae styled itself as Goguryeo's successor state.
In a time of relative peace and stability in the region, Balhae flourished in culture, especially during the long reign of the third King Mun (r. 737-793) and King Seon. At that time, Balhae was a culturally advanced country, so that even China referred to the Korean kingdom as "a prosperous country of the East." However, Balhae was severely weakened by the 10th century, and the Khitan Liao Dynasty conquered Balhae in 926.
Goryeo absorbed some of Balhae's territory and received Balhae refugees, including the crown prince and the royal family, but compiled no known histories of Balhae. The 18th century Joseon dynasty historian Yu Deukgong advocated the proper study of Balhae as part of Korean history, and coined the term "North and South States Period" to refer to this era.
Due to the lack of linguistic evidence, it is difficult to make a definitive conclusion for the linguistic relation between the Balhae and Silla languages.
Shoku Nihongi implies that the Balhae language, a Goguryeo language, and Silla language share a close relationship[clarification needed]: a student sent from Silla to Japan for an interpreter training in Japanese language assisted a diplomatic envoy from Balhae in communicating during the Japanese court audience.
However, the two surviving Balhae words (kundufu for "king" and furuki for "sable") seem to have more Tungusic linguistic relationship and origins than Koreanic.