Korean kingdom (57 BCE – 935 CE)
Source (Wikipedia): Silla

Silla was a Korean kingdom that existed between 57 BCE – 935 CE and was located on the southern and central parts of the Korean Peninsula. Silla, along with Baekje and Goguryeo, formed the Three Kingdoms of Korea. Silla had the lowest population of the three, approximately 850,000 people, significantly smaller than those of Baekje and Goguryeo.