When Chu-mong fled southward from Pu-yŭ he left behind him a wife and son. The latter was named Yu-ri. Tradition says that one day while playing with pebbles in the street he accidentally broke a woman’s water jar. In anger she exclaimed “You are a child without a father.” The boy went sadly home and asked his mother if it was true. She answered yes, in order to see what the boy would do. He went out and found a knife and was on the point of plunging it into his body when she threw herself upon him saying “Your father is living and is a great king in the south. Before he left he hid a token under a tree, which you are to find and take to him.” The boy searched every where but could not find the tree. At last, wearied out, he sat down behind the house in despair, when suddenly he heard a sound as of picking, and noticing that it came from one of the posts of the house he said “This is the tree and I shall now find the token.” Digging beneath the post he unearthed the broken blade of a sword. With this he started south and when he reached his father’s palace he showed the token. His father produced the other half of the broken blade and as the two matched he received the boy and proclaimed him heir to the throne. But he had two other sons by a wife whom he had taken more recently. They were Pi-ryu and On-jo. When Yu-ri appeared on the scene these two brothers, knowing how proverbially unsafe the head of a king’s relative is, feared for their lives and so fled southward. Ascending Sam-gak San, the mountain immediately behind the present Seoul, they surveyed the country southward. Pi-ryu the elder chose the country to the westward along the sea. On-jo chose to go directly south. So they separated, Pi-ryu going to Mi-ch’u-hol, now In-ch’ŭn near Chemulpo, where he made a settlement. On-jo struck southward into what is now Ch’ung-ch’ŭng Province and settled at a place called Eui-rye-sŭng, now the district of Chik-san. There he was given a generous tract of land by the king of Ma-han; and he forthwith set up a little kingdom which he named South Pu-yŭ. The origin of the name Păk-je is not definitely known. Some say it was because a hundred men constituted the whole of On-jo’s party. Others say that it was at first called Sip-je and then changed to Păk-je when their numbers were swelled by the arrival of Pi-ryu and his party. The latter had found the land sterile and the climate unhealthy at Mi-ch’u-hol and so was constrained to join his brother again. On the other hand we find the name Păk-je in the list of original districts of Ma-han and it is probable that this new kingdom sprang up in the district called Păk-je and this name became so connected with it that it has came down in history as Păk-je, while in truth it was not called so by its own people. It the same way Cho-sŭn is known today by the medieval name Korea. Not long after Pi-ryu rejoined his brother he died of chagrin at his own failure.