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 temple 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 present head of the dynasty is Bhumibol Adulyadej, King Rama IX.[1]) The Emerald Buddha, a dark green statue, is in a standing form, about 66 centimetres (26 in) tall, carved from a single jade stone ("emerald" in Thai means deep green colour and not the specific stone). It is carved in the meditating posture in the style of theLanna school of the northern Thailand. 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