national flag consisting of a yellow field (background) bearing vertical stripes of green and orange at the hoist and, at the fly end, a crimson rectangle with a sword-wielding lion and four bo (Bo tree) leaves. The width-to-length ratio of the flag is 1 to 2.

According to legend, Prince Vijaya, founder of Sri Lanka, arrived in the 5th century BC from Sinhapura (“Lion City”) in India. Since that time the Lion Flag has been the chief flag of the island's Sinhalese majority, except in those years when Sri Lanka was conquered by foreign invaders. Britain established its control over the island in 1815 when it overcame the king of Kandy, forcing him to lower the Lion Flag on March 2, 1815. Independence was restored on February 4, 1948, and the same Lion Flag, based on a painting of the original, was hoisted in celebration. The Union Jack (United Kingdom, flag of the) nevertheless also continued to fly until October 29, 1953.

The minorities on Sri Lanka felt that this flag represented only the majority Sinhalese. A parliamentary commission charged with examining the question finally proposed a new flag, which became official on March 2, 1951. The yellow border of the Lion Flag was extended around two vertical stripes placed near the hoist, green for the Muslims and orange for the Tamils (Tamil) (Hindus). A further change was made in the flag on May 22, 1972. In the corners of the crimson area behind the lion there had been yellow spires similar to those on the tops of temples. Buddhist leaders requested that these be replaced by leaves from the bo tree to recall that it was under such a tree that Siddhartha Gautama sat when he attained enlightenment and became the Buddha (“Enlightened One”). The flag of Sri Lanka incorporated further artistic modification of those leaves on September 7, 1978.