Phra Pathom Chedi is located in the area of Wat Phra Pathom Chedi Racha Wora Maha Wihan in Nakhon Pathom Muang district. It’s originally named Phra Thom Chedi, “Thom” means large, as it is the large stupa that houses the Buddha’s relics. Afterwards, King Rama IV built a stupa with 120 metres and 45 centimetres in height to cover the former, and named “Phra Pathom Chedi” after his belief that it was the first stupa built in the Southeast. Khun Srihavikromkriengkrai was in charge of designing the stupa and used iron chain wired around the stupa base which made the stupa strong. There is an annual event “Phra Pathom Chedi Festival” taking place annually from the 12th day of the waxing moon in the 12th month of the lunar calendar, a total of 9 days and 9 nights.