Chai Mongkhon, i.e. the principal Buddha image of Wat Yai Chai Mongkhon in Ayutthaya, was discovered underneath the base of the original ubosot and lay in ruins when it was found.

However, in 1987 AD it underwent a major renovation when it was restored and partly covered with gold leaf. It is flanked by two statues, representing the Buddha's disciples Sariputta (fig.) and Mogallana (fig.).