In the year 57 B.C. the chiefs of the six great Chin-han states, Yŭn-jun-yang-san, Tol-san-go-hö, Cha-sa-jin-ji, Mu-san-dă-su, Keum san-ga-ri and Myŭng-whal-san-go-ya held a great council at Yun-chŭn-yang and agreed to merge their separate fiefs into a kingdom. They named the capital of the new kingdom Sŭ-ya-bŭl, from which the present word Seoul is probably derived, and it was situated where Kyöng-ju now stands in Kyüng-sang Province. At first the name applied both to the capital and to the kingdom. They placed upon the throne a boy of thirteen years, named Hyŭk-kŭ-se, with the royal title Kŭ-sŭ-gan. It is said that his family name was Pak, but this was probably an afterthought derived from a Chinese source. At any rate he is generally known as Pak Hyŭk-kŭ-se. The story of his advent is typically Korean. A company of revellers beheld upon a mountain side a ball of light on which a horse was seated. They approached it and as they did so the horse rose straight in air and disappeared, leaving a great, luminous egg. This soon opened of itself and disclosed a handsome boy. This wonder was accompanied by vivid light and the noise of thunder. Not long after this another wonder was seen. Beside the Yŭn-yüng Spring a hen raised her wing and from her side came forth a female child with a mouth like a bird’s bill, but when they washed her in the spring the bill fell off and left her like other children. For this reason the well was named the Pal-ch’ŭn which refers to the falling of the bill. Another tradition says that she was formed from the rib of a dragon which inhabited the spring. In the fifth year of his reign the youthful king espoused this girl and they typify to all Koreans the perfect marriage. As this kingdom included only six of the Chin-han states, it would be difficult to give its exact boundaries. From the very first it began to absorb the surrounding states, until at last it was bounded on the east and south by the sea alone, while it extended north to the vicinity of the Han River and westward to the borders of Na-han, or to Chi-ri San. It took her over four hundred years to complete these conquests, many of which were bloodless while others were effected at the point of the sword. It was not until the twenty-second generation that the name Sil-la was adopted as the name of this kingdom.