Wat Na Phra Meru is located along the Khlong Sra Bua, to the north of the city moat (formerly the Lopburi River), directly opposite the Grand Palace in Phra Nakhon Si Ayutthaya Province. It was established during the early Ayutthaya period, in 2046 BE (1503 AD). The temple was founded by Prince In (a member of the royal family during the reign of King Rama Thibodi II) who, having great faith in Buddhism, requested permission from the king to build the temple. During the conflict with King Burengnong, in the reign of King Maha Chakrapat, an agreement was made to build a large pavilion beside the temple to serve as a temporary residence. This area, including Wat Phra Si Sanphet, played a significant role during the major battles between Ayutthaya and Burma in 2310 BE (1767 AD). Despite the devastation, King Alaungpaya of Burma spared this temple from destruction. The temple is renowned for its well-preserved early Ayutthaya architecture. The main chapel (ubosot) measures 50 meters in length and 16 meters in width, showcasing the architectural style of early Ayutthaya. The ubosot features wooden carvings of Vishnu on Garuda, stepping on the heads of serpents, and Rahu on either side of the serpent heads. The windows are long vertical openings, and the temple has two rows of eight square pillars each. The lotus-shaped pillar capitals are of Ayutthaya style. The principal Buddha image in the ubosot is a large bronze statue in the posture of Mara Victory (Mara Vijaya) known as Phra Buddha Nimit Wichit Maramoli Sri Sanphet Borom Trailokanath. This image, which is the largest surviving Ayutthaya-style Buddha statue, stands about 6 meters tall with a width of 4.40 meters. It is renowned for its grandeur and completeness.