Gyeru was an ancient Korea

Korea

Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

n city-state that formed within the former realm of Gojoseon

Gojoseon

Gojoseon was an ancient Korean kingdom. Go , meaning "ancient," distinguishes it from the later Joseon Dynasty; Joseon, as it is called in contemporaneous writings, is also romanized as Chosŏn....

. It later became a member of the confederation of Jolbon

Jolbon

Jolbon was a small, Korean tribal state which arose in the northern Korean peninsula from perhaps 1st century BCE.In 37 BCE, Jumong had fled from Dongbuyeo to avoid death at the hands of Dongbuyeo's Crown Prince Daeso, who presented great jealousy towards Jumong...

 together with Sono, Jeolno, Sun-no, and Gwan-no, and was given to King Dongmyeong.

12th century

The ancient city-state was founded as Hu-unga or "our place" in 1137 by Ming II of Yorushika. He and the royal council embraced ancient Chinese mythology through the area. The inhabitants practised Keechinatu, a chinese ritual involving an ongoing flame tribute to the Chinese gods and the dragons that they respected.

13th-16th century

At the fall of Ming IV, a new ruler from a new reign of royal council, Twang and his followers took modern approaches to the Chinese mythology. They adopted Heeakuwang, a water tribute to the Chinese gods that respected the tigers, pandas and other animals of the land.

16th century

The Haumang soldiers to the west invaded Gyeru and destroyed many of the temples and buildings. The civilization was mostly wiped out, however, there are still descendants that were alive as of the 21st century.