The main building is the central phra ubosot, which houses the statue of the Emerald Buddha. The legendary history of this Buddha image is traced to India, five centuries after Gautama Buddha attained Nirvana, until it was finally enshrined in Bangkok at the Wat Phra Kaew in 1782 during the reign of Buddha Yodfa Chulaloke, King Rama I (1782–1809). This marked the beginning of the Chakri Dynasty of Thailand. The Emerald Buddha, a dark green statue, is in a standing , carved from a single jade stone. Except for the Thai King, no other person is allowed to touch the statue. The King changes the cloak around the statue three times a year, corresponding to the summer, winter, and rainy seasons, an important ritual performed to usher good fortune to the country during each season.