Part I deals with Naresuan's boyhood, when he was taken hostage by Burmese King, Bayinnaung to keep the vassal Ayutthaya Kingdom subservient.

Part II depicts Naresuan as a young adult prince, already a formidable military strategist, as he leads his army on exploits against breakaway kingdoms for King Bayinnaung's successor, King Nonthabureng, and eventually breaks away to declare sovereignty for Siam.

In production for more than three years, the project has an estimated budget of 700 million baht, making it the most expensive Thai film made.

[1][2][3] As King of Fire, part II was selected as Thailand's submission to the 80th Academy Awards for Best Foreign Language Film.

This creates a rift between Naresuan's father and his mother, Queen Wisutkasat, whose brother is the king of the neighboring Ayutthaya kingdom, as Phitsanulok is now a Burmese vassal state.

There, while wandering the Thai village outside Pegu (made up of Thais displaced by Bayinnaung's expansionist campaigns and subsequent forced relocations to Hanthawadi), he befriends a Mon street child who is later allowed to work as a temple boy called Bunthing (later became Mon leader Lord Rachamanu).

Prince Naresuan, however, having been raised in Pegu (the kingdom of Hanthawadi) and who regards Bayinnaung as a second father, convinces Thammaracha to let him go in his place.

Upon arriving in Hanthawadi (Hongsawadi in Thai), Naresuan's childhood teacher, a Buddhist monk named Khan Chong, informs him about the dangers that king Nanda and many factions in Burma are plotting his assassination.

King Nanda sees it as disrespect and seizes the opportunity to wage war and siege the mountain top city.

According to history, the movie portrays king Naresuan firing the musket across the Sittaung River, and with one strike, killing the general of the Burmese army.

The second army is that of the King Noratra Mangsosri (Thai : นรธาเมงสอ) of Lanna (Chiang Mai) which attacks from the north of the Kingdom of Ayutthaya.

While two armies are preparing for continuing the war with Ayutthaya, the King of Lovek (Thai : ละแวก) sends Lord Jinjantu (Thai : จินจันตุ), a Chinese official, to spy in Ayutthaya, but a short time later, he heads back to Lovek because king Naresuan knows that he is a spy.

After an intense river battle between Jinjantu's Chinese troops and the Siamese gunboats under Naresuan's personal command, he is able to escape.

Nanda Bayin orders his son, Mingyi Swa to eliminate King Naresuan, saying that he doesn't care what losses the Burmese suffer.

The larger Burmese force under Mingy Swa was faced with a smaller army by King Naresuan.

This angers the King, and he quickly announces his intention to gather an army, capture Pegu, and burn it to the ground as revenge.

Natshinnaung the prince of Toungoo didn't enjoy Nanda Bayin's presence in the city so he got into an agreement with Naresuan.

[9] New tools and equipment have been made, the production crew were sent to training abroad, and the experts in the industry from such movies as “Troy,” “The Lord of the Rings,” and “Anaconda” have been working as the consultants and supervisors of the production of “Naresuan.” The experts have tremendously conveyed various techniques in movie making and assisted in training to equip the Thai crew members with the knowledge and skills necessary to produce quality movies and to enable them to develop to their fullest potential to raise the status of the film industry in Thailand to be equal to leading film industries in the western world in the near future.

[10] Actor Wanchana Sawatdee, in his feature film debut as Naresuan, is a cavalry officer in the Royal Thai Army with the rank of captain.

"The king is also a brave warrior, so Captain Wanchana, a professional cavalry soldier with a macho look, was a perfect fit for the character.

King Naresuan Part I: Hongsawadee's Hostage, grossed more than 100 million baht on its opening weekend, despite some production problems with the film.

[14] King Naresuan Part II: Reclamation of Sovereignty, premiered in a wide theatrical release in Thailand on February 15, 2007.

"[16] Jeerawat Na Talang, columnist for The Nation, wrote on her blog: "This is simply the best Thai film I have seen in years ...

"[17] Submitted as King of Fire, Part II was Thailand's entry to the 80th Academy Awards for Best Foreign Language Film.