The Phra Mahathat Woramaha Wiharn temple with its huge chedi (pagoda) is one of the most important Buddhist temples in Thailand, and one of the very oldest. It is one of only six primary royal temples. The exact dates and order of construction are unclear, although it is known that the Phra Borom That Chedi at the center of the temple pre-dates the rest of the buildings by as much a six hundred years.