"Sword" is based on the true story of King Naresuan the Great (1555 - 1605, also sometimes called Naret or the Black Prince) who was king of Siam (today Thailand) from 1590 until his death in 1605. He was a great warrior king and during his reign Siam had the biggest territorial extent in history.

King Naresuan the Great was known as the hero to Siamese people who gave him the utmost respect and praised him as a warrior king. While he was still a young prince he declared independence for Siam and restored Ayutthaya to the Siamese people less than 20 years after Ayutthaya was sacked during the reigns of his grandfather and uncle (1569). He recruited and appointed qualified commanders and administrators to fight and work respectively. He went to 27 different battle fields since he was 20 years old until his death at 50. Most of the time he was away from the capital and did not have enough time for marriage.

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