One year after ascending the throne, Lê Lợi was on a dragon boat cruising around Hồ Lục Thủy (Green Water Lake), directly in front of his palace. When they came to the middle of the lake, a giant turtle with a golden shell (Kim Qui) emerged from under the water surface. Lê Lợi ordered the captain to slow down, and at the same time looked down to see that the magic sword on his belt was moving on its own. The golden turtle advanced toward the boat and the king, then with a human voice, it asked him to return the magic sword to his master, Long Vương (Dragon King), who lived under the water. It suddenly became clear to Lê Lợi that the sword was only lent to him to carry out his duty, but now it must be returned to its rightful owner, lest it corrupt him. Lê Lợi drew the sword out of its scabbard and lobbed it towards the turtle. With great speed, the turtle opened its mouth and snatched the sword from the air with its teeth. It descended back into the water, with the shiny sword in its mouth, and for a long period a flickering light was said to have been seen from beyond the muddled depths of the lake. From then on, people renamed that lake to Hồ Gươm (Sword Lake) or Hồ Hoàn Kiếm (Lake of the Returned Sword).