Trat is a city with a rich past, and its history is closely interwoven with the destiny of the Thai nation. Known since the Ayutthaya Kingdom era, it has always played a vital role due to its strategic location on the eastern coast of the Gulf of Thailand. Although the exact date of the settlement's founding is not recorded in documents, the region is mentioned in historical chronicles as an important settlement named Bang Phra. Over time, the city received the name Trat, which, according to one theory, is derived from the name of a tree common in this area that was used to make brooms.
The development of the city as an administrative and trading centre was largely defined by its geography. Situated on the border with Cambodia and having access to the sea, Trat served as a natural buffer and a strategic outpost for protecting the kingdom's eastern frontiers. A crucial phase occurred during the events of the early 20th century: during the reign of King Rama V, the city was temporarily under French control but was returned to Siam in 1907 in exchange for other territories. This return became a symbol of maintaining national sovereignty, and local ports continued to play a key role, providing anchorage and supplies for merchant vessels navigating along the Indochina coast.
The economy of old Trat differed significantly from the modern one and was based on unique natural resources. The region was historically famous for rich deposits of rubies and sapphires, particularly in the Bo Rai district, which attracted prospectors and traders from all over the world. Furthermore, Trat was known as a major supplier of cardamom and other forest products, which were highly valued in Asian markets, shaping the commercial character of the province long before the development of mass tourism.