lần sửa đổi
[[Gaya Confederacy|Gaya]] was a confederacy of chiefdoms in the [[Nakdong River]] valley of southern [[Korea]], growing out of the [[Byeonhan confederacy]] of the [[Samhan]] period. And one of the [[Three Kingdoms of Korea]]. Gaya progress ironware culture. In 562, Gaya ultimately absorbed into [[Silla]].
Post-668 Silla kingdom is often referred to as [[Unified Silla]], though the term North-South States, in reference to Balhae, is also used.
[[Image:Temple-at-gyeongju.jpg|thumb|320px|[[Bulguksa]]|[[Bulguksa]] Temple is a [[UNESCO]] [[World Heritage Site]].]]
No historical records from Balhae have survived, and the Liao left no histories of Balhae. Goryeo (see below) absorbed some Balhae territory and received Balhae refugees, including the crown prince and the royal family, but compiled no known histories of Balhae either. The [[Samguk Sagi]] ("History of the Three Kingdoms"), for instance, includes passages on Balhae, but does not include a dynastic history of Balhae. The eighteenth 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.
The Later Three Kingdoms (892 - 936) consisted of [[Silla]], [[Hubaekje]] ("Later [[Baekje]]"), and [[Taebong]] (also known as Hugoguryeo, "Later [[Goguryeo]]"). The latter two, established as [[Unified Silla]] declined in power, were viewed as heirs to the earlier [[Three Kingdoms of Korea]].