Thai Flag History:
The current Thai flag was adopted on September 28, 1917, making it one of the world's older flags. From the mid-19th century until 1916, Thailand, which was called Siam until 1939, used a red based flag with a white elephant on it. That flag was replaced in 1916 with a red-white-red-white-red horizontal striped flag which was modified in 1917, when the blue center replaced red.