Trat was already an important seaport in the
Kingdom of Ayutthaya. Under King
Chulalongkorn (Rama V), Trat and Chanthaburi provinces were briefly occupied by the
French. In a complicated exchange of territory, Trat (and Chanthaburi) was returned on March 23, 1906, but Thailand relinquished the area around Siem Reap and Sisophon in present-day Cambodia. When the Vietnamese pushed the
Khmer Rouge out of
Cambodia in 1985,
Pol Pot fled to Thailand and made his headquarters in a plantation villa near Trat. It was built for him by the Thai Army and nicknamed "Office 87". == Geography ==