The national flag of Ancient Siam is unknown, however, there were some evidences that in the reign of King Narai (1590-1605) the red flag was hoisted to salute the French ship. The red flag was also used in the reign of King Boromokot (1732-1758) when Thai monks were sent to Sri Lanka. Thus, Prince Damrong Rajanub hab concluded that the red flag was the national flag of Siam in the ancient time.

BEFORE - 1782