Update - Wat Sam Wihan, known as the Monastery of the Three Preaching Halls, is an active temple located just off Ayutthaya’s city island in the Hua Ro Sub-district. Established in 1377 CE during the reign of King Boromracha I, it was named for its three viharas built along the old Lopburi River. The site is notable for its large reclining Buddha, the ordination hall with Luang Pho Thong, and the pavilion housing Luang Pho Khao. Over the centuries, Wat Sam Wihan played a strategic role in several wars, including the Burmese siege of Ayutthaya in 1563–64 and again in 1767, making it both a spiritual and historical landmark.