Or Wat Arunratchawararam Ratchaworamahawihan is the royal principal monastery built in Ayutthaya period. King Taksin the Great gained victory in the battle and moved his troop from Ayutthaya to see the new day at Wat Mokok. Since then, this auspice made this temple called " Wat Jaeng" King Rama lV graciously renamed as "Wat Arunratchawararam". It was the house of the Emerald Buddha before the Buddha image was invited to house at Wat Phra Kaeo. Is best known for a porcelain encrusted 79 meter central pagoda which sparkles in the sun. Ubosot houses the principal Buddha image mould by King Rama lV as "Phraphutta Thammisoraraj Lokatat Dilok". Inside Wihan contains some relics of Load Buddha,
Phra Arun (or Phra Jaeng), that King Rama lV graciously invited from Vientiane.