Wat Mahathat Yuwarajarangsarit Rajaworamahavihara (Thai: (Pronunciation)) is a Buddhist temple in Bangkok, Thailand. It is one of the 6 royal temples of the highest class (Thai: ).Built during Ayutthaya period, the temple was then known as Wat Salak. Soon after Bangkok was established as the capital of Siam, the temple became strategically situated in between the newly-built Grand Palace and Front Palace (residence of the vice-king). As a result, the temple was used for royal ceremonies and funerals.