Unified Silla

Unified Silla
Unified Silla lasted for 267 years .The name "Unified Silla" is a term that likely dates after the division of Korea in 1945. However, some parts of the Goguryeo territory remained outside Silla’s control.
In 660, King Munmu the Great ordered his armies to attack Baekje. General Kim Yu-shin, aided by Tang forces, defeated General Gyebaek and conquered Baekje. In 661, he moved on Goguryeo but was repelled. King Munmu was the first ruler ever to look upon the south of Korean Peninsula as a single political entity after the fall of Gojoseon. As such, the post-668 Silla kingdom is often referred to as Unified Silla.
Unified Silla and Tang Dynasty of China maintained close ties. This was evidenced by the continual importation of

The Jin dynasty favored the Balhae people as well as the Khitans. Jurchen proclamations emphasized the common descent of the Balhae and Jurchen people from the seven tribes, and proclaimed "Jurchen and Balhae are from the same family". The fourth, fifth and seventh emperors of Jin were mothered by Balhae consorts. The 13th century census of Northern China by the Mongols distinguished Balhae from other ethnic groups such as Goryeo, Khitan and Jurchen. This suggests that the Balhae people still preserved their identity even after the conquest of the kingdom.
Aftermath
After the fall of Balhae , the new Khitan masters had control over most of Balhae 's old territories. However, starting from 927, many rebellions were triggered throughout the domains. These rebellions were eventually turned into several Balhae revivals. In 934, Dae Gwang-hyeon, the last Crown Prince of Balhae, revolted against their Khitan masters. After being defeated, he fled to Goryeo, where he was granted protection and the imperial surname.
The Malgal constituted majority of its citizens, some forced into slave status into serving the Goguryeo ruling class. As such, they made the bulk of the labor class. Nevertheless, there were instances of Malgal moving upward into the Balhae elite. They were limited to the title of "suryong", or "chief", and played a part in the ruling

Social and political structure
Central government officials were divided into sixteen ranks, the six members of the top rank forming a type of cabinet, with the top official being elected every three years. The first to sixth rank were the officials I political affairs, and military commanders.. In the, the through the eleventh were officials may have head administrators . the twelfth to the sixteenth, may have been military administrators.
The chief minister was chosen by a unique system. The names of several candidates were placed under a rock (Cheonjeongdae) near Hoamsa temple. After a few days, the rock was moved and the candidate whose name had a certain mark was chosen as the new chief minister. Whether this was a form of selection-by-lot or a secret election by the elite is not clear.
Little is known of Baekje music, but local musicians were sent with tribute missions to China in the 7th century, indicating that a distinctive musical tradition had developed by that