The Grand Palace, with its golden temples, pavilions and gardens, was the official residence of the King of Thailand from the 18th century until the mid-20th century. The construction began in 1782 during the reign of King Rama I, when he moved the capital across Chao Phraya River from Thonburi. Over time, the palace has been constantly expanded and many additional structures added. Today it is only used for state occasions and special events. Within the palace's extensive grounds is the most sacred and important of all Thai temples, the Wat Phra Kaew, or the 'Temple of the Emerald Buddha'. This temple contains the most revered Buddha image in the country, the Emerald Buddha, made from one solid piece of translucent green jade. The grounds also contain a model of Angkor Wat, added by King Rama III, since the Khmer empire of Cambodia and Thais shared cultural and religious roots.