Wat Sothon Wararam was built in the late Ayutthaya Period during the reign of King Narai the Great, with its original name being Wat Hong. The temple houses Phra Phutthasothon, a much-revered Buddha image of Chachoengsao created by a craftsman from Lanchang. The image sits in the meditation position and is 1.65 meters in width and 1.48 meters in height.
Legend has it that three Buddha images were floating down a river. The first image was found on the Mae Klong River, placed at Wat Phet Samut and named Luangpho Ban Laem. The second image, Luangpho Sothon, was placed at Wat Hong or currently known as Wat Sothon Wararam. The last image, Luangpho To, was placed at Wat Bang Phli Yai Nai or also called Wat Phlapphla Chai Chana Songkhram.