The temple of Wat Phra That Doi Suthep is certainly one of the most important temples in Chiang Mai, as well as one of the most revered among all Thais. The temple is a major pilgrimage destinations during the important Buddhist holidays of Makha Buja and Visak. Its importance, as well as its location, owes much to the legend of its founding.
According to this legend, a Buddha relic, which some say glowed, magically replicated just before it was about to be enshrined in the big chedi at Wat Suan Dok. The "cloned" relic was placed on the back of a sacred white elephant, which was allowed to roam where-ever it wanted.
The elephant eventually climbed to the top of Suthep Mountain, trumpeted three times, turned around three times, knelt down and died. This was taken as a sign that this was the spot where the relic wanted to be, so King Ku Na built the original of the chedi on Doi Suthep at the end of 14th century.