After the Paknam crisis in 1893, French colonial troops occupied Chanthaburi, returning it in 1905 when Thailand gave up ownership of the western part of Cambodia. A significant minority of Chanthaburi citizens are native Vietnamese, who came there in three waves: first in the 19th century during anti-Catholic persecutions in Cochin China; a second wave in the 1920s to 1940s fleeing French Indochina; and a third wave after the communist victory in Vietnam in 1975. The town of Chanthaburi has been the seat of a Bishop of Chanthaburi since 1944.