Located in centre of Hanoi is Hoan Kiem Lake, also known as Sword Lake, one of the most popular sites in the city. It is unique as there is a historic temple, Turtle Tower, situated in the middle. Legend states that Emperor Le Loi in 1428 was boating on the lake when a Golden Turtle God, Kim Qui, surfaced to reclaim his magic sword. Turtle Tower is also linked to this legend. It was erected during the reign of Le Thank Long in the late 15th century.