Yaksha is the name of a broad class of nature-spirits, usually benevolent, who are caretakers of the natural treasures hidden in the earth and tree roots. They appear in Hindu, Jain and Buddhist mythology. The Ramakien is the Thai version of the Indian epic, the Ramayana or the 'Romance of Rama', and has an important influence on Thai literature, art and drama. It is regarded as the National Epic of Thailand. Wat Phra Kaew (Temple of the Emerald Buddha); full official name Wat Phra Si Rattana Satsadaram is regarded as the most sacred Buddhist temple in Thailand. It is located within the precincts of the Grand Palace. The Grand Palace served as the official residence of the Kings of Thailand from the 18th century onwards. Construction of the Palace began in 1782, during the reign of King Rama I, when he moved the capital across the river from Thonburi to Bangkok.