Ekathotsarot เอกาทศรถ
King of Ayutthaya
Statue at Wat Pha Mok,Ang Thong
King of Siam
Reign	25 April 1605 – 1610/11[1]
Predecessor	Naresuan
Successor	Si Saowaphak
Viceroy of Siam
Tenure	1590 – 25 April 1605
Appointer	Naresuan
Predecessor	Naresuan
Successor	Sutat
Born	1560 Phitsanulok,Ayutthaya Kingdom
Died	1610/11[2] (aged 50/51) Ayutthaya,Ayutthaya Kingdom
Issue	Suthat,Viceroy of Siam KingSi Saowaphak KingSongtham Sisin Ong Thong
Names Ekathotsarot Sanphet III
House	Sukhothai Dynasty
Father	Maha Thammaracha
Mother	Wisutkasat

Ekathotsarot (Thai:เอกาทศรถ,pronounced[ʔēː.kāː.tʰót.sā.rót],Ekādaśaratha) orSanphet III (Thai:สรรเพชญ์ที่ ๓); 1560 – 1610/11) was theKing of Ayutthaya from 1605 to 1610/11^[3] and overlord ofLan Na from 1605 to 1608/09, succeeding his brotherNaresuan. His reign was mostly peaceful as Siam was a powerful state through the conquests of Naresuan. It was also during his reign that foreigners of various origin began to fill the mercenary corps. In particular, the king had a regiment of professional Japanese guards under the command ofYamada Nagamasa.^[4]: 51

Right around Ekathotsarot's reign, the English first came to Siam in 1612.^{[4]: 53 [5]: 242}

The White Prince was the son ofMaha Thammarachathirat ofPhitsanulok and QueenWisutkasat. White Prince had an elder brother who was called The Black Prince, and an elder sister known as the Golden Princess.

In November 1563, Phitsanulok came under attack by KingBayinnaung ofBurma. Faced with an overwhelming force, Maha Thammarachathirat surrendered in January 1564, and agreed to join Bayinnaung's assault on Ayutthaya. With Phitsanulok's help, Bayinnaung forced KingMaha Chakkraphat of Ayutthaya to surrender in February 1564.^[6][7] Bayinnaung brought back the Black Prince and White Prince, along with Ayutthaya king Maha Chakkraphat. The two princes were educated and overseen by Bayinnaung, along with other captive princes.

When Ayutthaya revolted in May 1568, Maha Thammarachathirat remained loyal to Bayinnaung, and became the vassal king of Siam when Bayinnaung's forces retook Ayutthaya in August 1569.^[8] The Black and White Prince then returned to Ayutthaya in 1571.

Prince Ekathotsarot joined his brother Naresuan in various wars with the Burmese. Naresuan declared independence in May 1584, and fought off a series of Burmese invasions from 1584 to 1593. In 1590, Maha Thammarachathirat died. Naresuan was crowned as the King of Ayutthaya while Ekathotsarot was madeUparaja but with equal honor to Naresuan (As in the case ofMongkut andPinklao).

The end of this series of Burmese invasions came in January 1593. Crown Prince of Burma,Mingyi Swa invaded Siam once more. He conducted anelephant duel with Naresuan, and was slain in the armed conflict.

In 1595, Pegu faced rebellions by various tributaries and royal princes. Naresuan planned a massive invasion of Pegu but the city was taken beforehand by the Lord of Toungoo, with the support ofArakan. The efforts to capture Toungoo failed in May 1600, and Naresuan decided to retreat. InLanna, however, a conflict arose betweenNawrahta Minsaw, the Burmese king of Lanna, and Phraya Ram, a Siamese-installed Lanna noble. Naresuan sent Ekathotsarot to claim the conflicts by dividing Lanna into two parts.

Naresuan died in 1605 while planning to invade the BurmeseShan states. Ekathotsarot was crowned as his successor.

Upon hiscoronation, the Ayutthaya kingdom had reached the maximum extent. However, immediately after the coronation, the Lanna kingdom broke away.

In 1612, an English expedition arrived in Siam carrying a letter fromKing James I of England requesting permission for English merchants to trade in Siam. The King warmly welcomed the party and granted them a station for trading as well as presenting them with lavish gifts.In 1613–1614, Burmese kingAnaukpetlun invaded the Tenasserim coast. He gained Tavoy but was driven back with heavy losses atMergui.^[9] (The Burmese then invaded Lan Na in April 1614. Lan Na sought help fromLan Xang but no help ever came, and Chiang Mai fell to the Burmese in December 1614.^[10][9] Note that according to Damrong, in 1618 Siam and Burma reached an agreement in which Burma would controlMartaban and Siam would control Chiang Mai.^{[5]: 197–199} But international scholarship accepts that Lan Na again became a Burmese vassal.^[9][11]

During the reign of Ekathotsarot, a Siamese embassy reached the Dutch city ofThe Hague, in 1608.^[12] The embassy of 16 was brought to theDutch Republic by AdmiralCornelis Matelief de Jonge on board theOranje, leavingBantam on January 28, 1608.^[13] The embassy arrived in The Hague on September 10, 1608, and met withMaurice of Nassau, Prince of Orange.^[14] This visit coincided with the application for a patent of thetelescope by the Dutch eyeglass makerHans Lippershey, and this new device was mentioned at the end of a diplomatic report on the Siamese Embassy,Ambassades du Roy de Siam envoyé à l'Excellence du Prince Maurice, arrive a La Haye, le 10. September, 1608 ("Embassy of the King of Siam sent to his Excellence Prince Maurice, September 10, 1608"), which soon diffused across Europe.^[15]

Following the embassy, a treaty was concluded between the Republic and Siam in 1617.^[16]

Ekathotsarot's reign saw the influx of foreigners into Siam as traders and mercenaries. Ekathotsarot establishedKrom Asas ('committee of volunteers', i.e. volunteered regiments) of foreign soldiers, for example;Krom AsaMon,Krom AsaCham,Krom Asa Yipun (Japanese mercenaries), andKrom Asa Maen Puen (literally 'committee of volunteer marksman' – the Portuguese and Dutch). Ekathotsarot had close relations with theTokugawa shogunate underTokugawa Ieyasu who commissionedRed Seal Ships to Siam. Around this time the Siamese metallurgists learned the arts of forging mortars from Westerners and combined with traditional methods giving rise to the praised Siamese mortars known for their qualities.

Ekathotsarot had two legitimate sons: Prince Suthat and PrinceSri Saowabhak. Prince Suthat was invested with the title ofUparaja in 1607. However, only four months later, Prince Suthat asked his father to release a prisoner; but instead angered his father, who accused Prince Suthat of a rebellion. Prince Suthat committed suicide by poison the same night, much to the grief of Ekathotsarot. This is one of the most mysterious historical scenes of Siamese history, as no one knows who was the prisoner Prince Suthat tried to free, nor why Ekathotsarot was so angry. Some historians hypothesized that the prisoner was one of the powerful nobles whose power was a challenge to the monarchy. The nature of Prince Suthat's death was also disputed, as he may have been poisoned by someone else.

Whatever the fact may be, the Prince Suthat incident laid the grounds for future princely struggles that would plague Ayutthaya for about another century. As his son was dead, Ekathotsarot did not appoint his second son, Prince Sri Saowabhak,Uparaja, as expected. It was said that Ekathotsarot died of depression following the Prince Suthat incident, in 1610/11. Prince Sri Saowabhak succeeded to the throne anyway.

• Harvey, G. E. (1925).History of Burma: From the Earliest Times to 10 March 1824. London: Frank Cass & Co. Ltd.
• Lieberman, Victor B. (1984).Burmese Administrative Cycles: Anarchy and Conquest, c. 1580–1760. Princeton University Press.ISBN 0-691-05407-X.
• Phayre, Lt. Gen. Sir Arthur P. (1883).History of Burma (1967 ed.). London: Susil Gupta.
• Borschberg, Peter (2011),Hugo Grotius, the Portuguese and Free Trade in the East Indies, KITLV Press, Leiden,ISBN 978-9067-1836-73.https://www.academia.edu/4302729
• Borschberg, Peter, ed (2015),Journal, Memorials and Letters of Cornelis Matelieff de Jonge, NUS Press, Singapore,ISBN 978-9971-69-798-3.https://www.academia.edu/4302783.
• Smithies, Michael (2002),Three military accounts of the 1688 "Revolution" in Siam, Itineria Asiatica, Orchid Press, Bangkok,ISBN 974-524-005-2

• 16th-century births
• 1620 deaths
• Sukhothai dynasty
• Kings of Ayutthaya
• 17th-century monarchs in Asia
• Princes of Ayutthaya
• 16th-century Thai people
• 17th-century Thai people

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