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.
Later Silla was a golden age of art and culture, 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.
Later Silla carried on the maritime prowess of Baekje, which acted like the Phoenicia of medieval East Asia, and during the 8th and 9th centuries dominated the seas of East Asia and the trade between China, Korea and Japan, most notably during the time of Jang Bogo; in addition, Silla people made overseas communities in China on the Shandong Peninsula and the mouth of the Yangtze River. Later Silla was a prosperous and wealthy country, and its metropolitan capital of Gyeongju was the fourth largest city in the world. 
Buddhism flourished during this time, and many Korean Buddhists gained great fame among Chinese Buddhists and contributed to Chinese Buddhism, including: Woncheuk, Wonhyo, Uisang, Musang, and Kim Gyo-gak, a Silla prince whose influence made Mount Jiuhua one of the Four Sacred Mountains of Chinese Buddhism.
Silla began to experience political troubles in the late 9th century. 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, the name of which was another transcribed version of Mohe (靺鞨, a Tungus Tribe speaking a language like Manchurian and Sibe), 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 or chief of Sumo Mohe, after defeating the military of central government of Tang Dynasty at the Battle of Tianmenling. 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 this 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.
One terminology that people of Balhae used to describe "a king" is Gadokbu (transcribed as 可毒夫).
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- Old records of Silla 新羅古記(Silla gogi): ... 高麗舊將祚榮
- Rhymed Chronicles of Sovereigns 帝王韻紀(Jewang ungi): ... 前麗舊將大祚榮
- Solitary Cloud 孤雲集(Gounjib): ... 渤海之源流也句驪未滅之時本爲疣贅部落靺羯之屬寔繁有徒是名栗末小蕃甞逐句驪, 內徙其首領乞四羽及大祚榮等至武后臨朝之際自營州作孼而逃輒據荒丘始稱振國時有句驪遺燼勿吉雜流梟音則嘯聚白山鴟義則喧張黑姶與契丹濟惡旋於突厥通謀萬里耨苗累拒渡遼之轍十年食葚晚陳降漢之旗.
- Solitary Cloud 孤雲集(Gounjip): ... 其酋長大祚榮, 始受臣藩第五品大阿餐之秩
- Comprehensive Institutions 通典(Tongdian): ... 渤海夲栗末靺鞨至其酋祚榮立國自號震旦, 先天中 玄宗王子始去靺鞨號專稱渤海
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