State that unified the Korean peninsula for the first time in 668 CE and ruled as the Silla dynasty until the tenth century.

Independent Korean kingdom in southeastern part of peninsula; defeated Koguryo along with their Chinese Tang allies; submitted as a vassal of the Tang emperor and agreed to tribute payment; ruled united Korea by 668. (p.462)

Silla (57 BCE - 935 CE), occasionally spelled Shilla, was one of the Three Kingdoms of Korea. It began as a chiefdom in the Samhan confederacies. Allied with China, Silla eventually conquered the other two kingdoms, Baekje in 660 and Goguryeo in 668.