Bowring Treaty

Treaty of Friendship and Commerce between Great Britain and Siam (Thai: หนังสือสัญญากรุงเทพมหานครกับกรุงอังกริษเปนทางไมตรีค้าขายกัน), known colloquially as the Bowring Treaty, was the historic landmark treaty signed between the United Kingdom during the reign of Queen Victoria and the Kingdom of Siam during the reign of King Mongkut on 18 April 1855 at Thonburi, Bangkok.