Sri Harmandir Sahib, also called the Darbar Sahib and the Golden Temple, is the holiest of all Sikh religious places. The city of Amritsar, the pool of nectar, was founded by the Fourth Guru, Sri Guru Ram Dass Ji around 1564, when he had a tank dug in the Sultanwind area. This was completed by the Fifth Guru in 1588. In 1586, Guru Arjan Dev Ji began work for the completion of the tank that had been started by Guru Ram Dass Ji. He had the tank lined with brickwork. He named the tank Amritsar, the pool of nectar, and the city also came to be called by the same name.