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).