Lê Lợi
The stories largely agree on what happened to the sword: One day, not long after the Chinese had accepted Vietnam as independent, Lê Lợi was out boating on a lake in Hanoi. The golden turtle, Kim Quy, 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. Suddenly it 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. Lê Lợi then acknowledged the sword had gone back to the Long Vương (Dragon King) and caused the lake to be renamed 'The Lake of the Returned Sword' (Hoan Kiem Lake) located in present-day Hanoi.