POM PHET





Pom Phet, or the Diamond Fort, was one of the sixteen fortresses along the city walls of Ayutthaya, situated in the southeast, at the confluence of the Pa Sak River and the Lopburi River (1) in the Bang Kraja area (2) and on the east bank of the Nai Kai Canal. Pom Phet was the most important fortress, protecting the harbour where foreign ships were forced to anchor for inspection and unloading. No foreign ships travelling up the Chao Phraya River before were allowed beyond this point. In 1767 CE, the Burmese could not penetrate Ayutthaya from this fort. The city walls were finally breached on the northeast side of the main island at the Maha Chai Fort. Pom Phet is one of the two remnants of old forts and is now a public park. The other site is the Khao Pluak Fort. The site has been renovated since severe damage occurred from water erosion to the river banks.

Prince Damrong situates the construction of Pom Phet and Pom Sattakop (a fort in the north-west of the city) during the reign of King Maha Chakkraphat (1548-1569 CE), shortly after the first attack of Ayutthaya by the Burmese in 1549 CE, King Chakkraphat realised that Ayutthaya had entered the age of the gunpowder and large guns came to dominate the war theatre and thus strengthened the defences of the city by a series of construction works: city walls were reinforced and redone in brick (brick does not shatter on impact from a cannonball as stone does) a new northern moat was dug to protect the northern part of the city - the Maha Nak Canal and walled forts were built along the city wall, mostly at waterway intersections. [1]





(View of Pom Phet from the river - March 2010 CE)



Ayutthaya was conquered in 1569 CE and became temporarily a vassal state of Burma. King Maha Thammaracha (reign 1569-1590 CE) was allowed to build new walls around the city under the pretext of a threat from Cambodia (1570 CE). The new walls were extended to the riverbanks in 1580 CE. [2]


The moat by the front ramparts on the east was dug 20 m wide and 6 m deep from the Maha Chai Fort down to connect with Bang Kraja Village.


"In 924, a year of the dog, fourth of the decade, the King had the Royal Metropolis renovated. He had the moat by the front ramparts on the east dug ten wa wide and three wa deep from the Maha Chai Fort at the Back Palace down to connect with Kaca Village [Canal?]. Then he had the city walls moved out to the banks of the river, the outer limit of the Royal Metropolis, and connected with the Maha Chai Fort, and from the Maha Chai Fort connected down to the Phet Fort." [3]


The original Phet fortress was circularly shaped and probably constructed under the architectural guidance of the Portuguese. The earliest drawing of the fortress is seen in the Iudea painting from Johannes Vingboons, published around 1665 CE, and likely based on information dating from Jeremias Van Vliet's stay in Ayutthaya. The fortress is visible in the painting with a round shape. Archaeological evidence indicates that the first walls were up to 6.5 meters wide and consisted of brick and laterite, while the interior was filled with rubble. King Narai (reign 1656-1688) CE was very interested in the architectural skills of the Sicilian Jesuit priest Tomasa Valguarnera (3) and asked him to take charge of the rebuilding of the walls and forts of Ayutthaya in 1663 CE. Valguarnera designed and superintended the construction of new forts at Ayutthaya, Bangkok, Nonthaburi, and other places, primarily intended to counter Dutch aggression (4). [4]





(Detail of Pom Phet - Johannes Vingboons - 1665 CE)



In 1685 CE, the French engineer La Mare (5) arrived with the ‘de Chaumont - de Choisy’ embassy and remained at King Narai's request to build fortifications. He designed fortifications for Ayutthaya (6), Lopburi (including Thale Chupson), Nakhon Sri Thammarat, Songkhla, Phatthalung, Mergui and Inburi and implemented temporary improvements to the fortifications of Bangkok. [5]


Likely, the French built a hexagonal structure (7) on the original foundation of Pom Phet. This can be seen on de Courtaulin's map of 1686 CE, showing the fortress with a more rectangular outlook. The rounded shape of the old fortress created "dead" zones, which sheltered attackers from defending fire. The round turret was extended into a diamond or star-shaped fortress to improve its defence. Bastions were added to provide covering fire from different angles. The name "Diamond Fortress" is derived from the fort's shape or the ancient Greek word for Diamond – ‘adámas’ meaning ‘unbreakable.’


Pom Phet was a large fort built of laterite 6.4 metres high (three fathoms and two cubits), about 1 meter higher (2 cubits) than the palace wall. The fort had a walkway of 5.5 metres (three fathoms) wide and a wall around the walkway. There was one tunnel gate to the left and one to the right of the fort, both leading out onto a platform around the fort. The platform had a wall around it. There were eight guns placed at the apertures, and on the storey below, there were cannons mounted on carriages in all sixteen apertures. [6]


The fort had a cavalier, a tower dominating the fort and the nearby countryside. Next to the main fort were another three bastions - projecting parts of the fort - built against the line of the city wall covering the harbour area. The bastions can be seen on Kaempfer's map of Ayutthaya.


Kaempfer, in his work "The History of Japan", wrote: At the lower end of the City appears a large bastion advancing into the water, besides several small ones. The first is furnished with cannons against the ships coming up. To fence the city wall against the wasting of the current, a narrow bank, or key is left, which is built upon in many places. [7]


Most parts of the wall and the fortresses were dismantled in the reign of King Rama I, who ordered the bricks taken to be used to construct the new capital in Bangkok. [8]





(View of Pom Phet - July 2012 CE)



Footnotes:


(1) Few people realise the Chao Phraya River was not running on the west side of the city island in the Ayutthaya period. In the Ayutthaya era, the Lopburi River flowed around the city. The old Chao Phraya River ran through the Bang Ban Canal to Si Kuk and from there to Bang Sai (historical site: Chedi Wat Sanam Chai), where the Lopburi River joined the Chao Phraya River. At the time, the Chao Phraya River was situated about ten kilometres west of the centre of Ayutthaya. The city was linked to the ancient Chao Phraya River northwest of Ayutthaya via the Khlong Maha Phram and in the southwest via the Khlong Nam Ya. Steve Van Beeck (1994), in 'The Chao Phya: River in Transition" (Oxford University Press - New York.), writes that "It was not until 1857 that an alternative path was created [for the Chao Phraya River]. A 5-kilometre channel was dug from the entrance of Wat Chulamani to Ban Mai. The river responded by following this new course and abandoning the old one, in effect making a secondary river of the stretch that ran from Ban Mai, and into the Chao Phya Noi. Half as wide as the river above and below it, the 1857 Ban Mai shunt funnels the Chao Phya down to Ayutthaya."

(2) Bang Kraja was a Chinese settlement area known for its water market opposite the Pom Phet fortress. It was an area where the Chinese and Cham sold sugar, sago small grain and large grain, sulphate, red sandalwood, ratan gear and other goods.

(3) Father Tomasa Valguarnera, a Sicilian, arrived from Macau in 1655 CE and remained in Siam for 15 years. In 1663 CE, Father Cardosa was sent to Ayutthaya to replace Valguarnera as superior, as King Narai had asked the latter to rebuild the walls of Ayutthaya. Valguarnera rebuilt the city walls of Ayutthaya until 1670 CE. He was appointed a Visitator of the Japanese and Chinese Provinces and left Siam. He returned to Siam in 1675 CE and again was occupied with rebuilding the walls of Ayutthaya until his death in Ayutthaya in 1677 CE.

(4) Dutch blockade of the Chao Phraya River in 1663 CE, after the announcement the previous year of a royal monopoly on Siamese exports.

(5) One of the possible drafters of the Bellin Map. de La Mare was initially embarked to teach piloting to the marine guards of the embassy and apparently was not a trained engineer in France. He was, although, a gifted, self-made man and fell soon in the taste of Constantine Phaulcon. On the arrival of the second French Embassy in 1687 CE - which was carrying four "Ingenieurs du Roi" to the French general Desfarges - the works at the fort in Bangkok were already ongoing. La Mare found him soon at loggerhead with Jean Vollant des Verquains, one of the four engineers working in Siam in 1687-1688 CE.

(6) Brick fortresses were constructed to replace the old fortifications. Known fortresses were Pom Maha Chai, Pom Sattakop, Pom Phet, Pom Ho Ratcha Khrue and Pom Khao Pluak.

(7) Hexagonal-shaped ramparts are usually found in forts built by the French, such as the Lopburi and Bangkok fortresses constructed during the reign of King Narai.


References:


[1] Rajanubhap, Damrong (Prince) (1917). Our Wars with the Burmese. White Lotus, Bangkok (2000). p. 66.

[2] Wood, William, A.R. (1924). A History of Siam. Chalermnit Press. p. 114, pp 128-130.

[3] Cushman, Richard D. & Wyatt, David K. (2006). The Royal Chronicles of Ayutthaya. Bangkok: The Siam Society. p. 82

[4] Cerutti, Pietro S.J. The Jesuits in Thailand. Part I (1607-1767).

[5] Smithies, Michael (2002). Desfarges (General), De La Touche (Lieutenant.), Jean Vollant - Des Verquains. Three Military Accounts of the 1688 'Revolution' in Siam. Orchid Press.

[6] Baker, Chris (2011). Note On Testimonies And Description Of Ayutthaya. Journal of the Siam Society. Vol. 99.

[7] Kaempfer, Engelbert (1727). The History of Japan (Together with a Description of the Kingdom of Siam). John Gaspar Scheuchzer.

[8] Wood, William, A.R. (1924). A History of Siam. Chalermnit Press. p. 273.