In Buddhist mythology, the Yak?a (Yaksha or Yak) are the attendants of Vai?rava?a, the Guardian of the Northern Quarter, a beneficent god who protects the righteous. The term also refers to the Twelve Heavenly Generals who guard Bhai?ajyaguru, the Medicine Buddha. Wat Arun Rajwararam (Temple of the Dawn), full name Wat Arunratchawararam Ratchaworamahawihan, is a Thai Buddhist temple on the Thonburi west bank side of the Chao Phraya River in Bangkok. It is named after Aruna, the Indian God of Dawn. A monastery has stood here since the Ayutthayan period (1351 - 1767), but the temple's outstanding feature, the Khmer-style central prang, was not begun until 1809, during the reign of King Buddha Loetla Nabhalai (Rama II).