Wat Dhammikaraj is located on the east of the ancient palace. Being built before the foundation of Ayutthaya, the royal temple of the Maha Nikai demonization was initially named Wat Mukaraj. When King Sai Nam Phueng had Wat Phanan Choeng built, his son, King Dhammikaraj, ordered the temple to be built in the old city area, which was formerly known as Mueng Sangklaburi before the time of Ayutthaya. The temple had been well maintained since then. In 1610, Somdet Phra Boromma Trailokkanat restored the place and had a large nine-room vihan, the ‘Harn Song Dhamma’, built for listening to sermon on Buddhist Sabbaths.