Chatusadom

{{Short description|Governance system of the Ayutthaya, Thonburi, and Rattanakosin Kingdoms}} {{Redirect2|Mahatthai|Kalahom|the modern ministries|Ministry of Interior (Thailand)|and|Ministry of Defence (Thailand)}}

'''Chatusadom''' or '''Catustambha''' ({{langx|th|จตุสดมภ์}} {{rtgs|''Chatusadom''}}, literally "Four Pillars" from Sanskrit ''Catur'' "Four" + ''Stambha'' "Pillars") was the Thai system of central executive governance during the Ayutthaya Kingdom, Thonburi Kingdom and Rattanakosin Kingdom from 1454 to 1892. For about four hundred years, it had served as the constitution of central government of Siam or Thailand until King Chulalongkorn organized ''Chatusadom'' into modern ministries and officially established the Cabinet on April 1, 1892.

==The ''Chatusadom'' system== King Trailokanat promulgated the constitution of ''Chatusadom'' in his Palatine Law, or ''Phra aiyakan tamnaeng na phonlaruean'' ({{langx|th|พระไอยการตำแหน่งนาพลเรือน}}), with the promulgation date being 1454.<ref>{{cite web |last1=King Prajadhipok's Institute |title=การปกครองแบบหัวเมือง |url=http://wiki.kpi.ac.th/index.php?title=%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%9B%E0%B8%81%E0%B8%84%E0%B8%A3%E0%B8%AD%E0%B8%87%E0%B9%81%E0%B8%9A%E0%B8%9A%E0%B8%AB%E0%B8%B1%E0%B8%A7%E0%B9%80%E0%B8%A1%E0%B8%B7%E0%B8%AD%E0%B8%87}}</ref> The original written law had been lost, however. ''Chatusadom'' went through subsequent amendments over time and King Rama I enacted the Palatine Law in the Three Seals Law,<ref>{{cite web |last1=ศูนย์ข้อมูลกฎหมายกลาง สํานักงานคณะกรรมการกฤษฎีกา |title=ความเป็นมาของกฏหมายตราสามดวง |url=http://www.thailaws.com/download/thaidownload/200year_3duanglaw.pdf}}</ref> from which the ''Chatusadom'' was mostly studied.

The ''Chatusadom'' bureaucracy was divided into ''Phonlaruean'' ({{langx|th|พลเรือน}}) or Civil Affairs and ''Thahan'' ({{langx|th|ทหาร}}) or Military Affairs.<ref name=":0">{{Cite book|last=Wales|first=Quaritch|title=Ancient Siamese Government and Administration|publisher=Bernard Quaritch Ltd|year=1934|location=London}}</ref> ''Chatusadom'' was led by two Prime Ministers, alternatively Grand Chancellors ({{langx|th|อัครมหาเสนาบดี}}) who held the rank of ''Chaophraya''.

{| class="wikitable" |- ! Post Name !! Title Name !! Office Name !! Seal !! Duties |- | ''Samuhanayok'' ({{langx|th|สมุหนายก}}) || ''Chaophraya Chakkri'' ({{langx|th|เจ้าพระยาจักรี}}) || ''Krom Mahatthai'' ({{langx|th|กรมมหาดไทย}}) || frameless|upright=0.5 The Seal of the Lion or the ''Rajasiha'' Seal || oversaw ''Phonlaruean'' or Civil Affairs all over the kingdom including the Four Ministries. |- | ''Samuhakalahom'' ({{langx|th|สมุหกลาโหม}}) || ''Chaophraya Mahasena'' ({{langx|th|เจ้าพระยามหาเสนา}}), alternatively ''Phraya Kalahom'' ({{langx|th|พระยากลาโหม}}) || ''Krom Kalahom'' ({{langx|th|กรมกลาโหม}}) || frameless|upright=0.5 Gajasiha Seal || oversaw Military affairs. |}

Below ''Samuhanayok'' in Civil affairs were the Four Ministries, from which ''Chatusadom'''s name was derived. Each ministry was led by a ''Senabodi'' or Minister who held the rank of ''Phraya'' and each ministry had a Thai and a Sanskrit-derived name.

{| class="wikitable" |- ! Office Name !! Title name !! Seal !! Duties |- | ''Krommawiang'' ({{langx|th|กรมเวียง}}) or ''Nakhonban'' ({{langx|th|นครบาล}}) from Sanskrit ''Nagara'' "City" + ''Pala'' "protector" || ''Phraya Yommarat'' ({{langx|th|พระยายมราช}}) || frameless|upright=0.5 "Yama Riding Lion" Seal || The Police Bureau; guarded cities. Also occasionally led troops into foreign wars. |- | ''Krommawang'' ({{langx|th|กรมวัง}}) or ''Thammathikon'' ({{langx|th|ธรรมาธิกรณ์}}) from Sanskrit ''Dhamma'' "Law" + ''Adikara'' "authority" || ''Phraya Thammathibodi'' ({{langx|th|พระยาธรรมาธิบดี}}) || frameless|upright=0.5 "Shiva Riding Nandi" Seal || Ministry of Palatial Affairs. Oversaw the ceremonies of the palace and Buddhist religious affairs.

Oversaw legal matters and trials. Also responsibled for assigning the "Yokkrabats" (similar to Magistrates) to the farther provinces. |- | ''Krommakhlang'' ({{langx|th|กรมคลัง}}) or ''Kosathibodi'' ({{langx|th|โกษาธิบดี}}) from Sanskrit ''Kosa'' "Pocket" + ''Adhipati'' "Lord" || ''Phraya Sithammarat'' ({{langx|th|พระยาศรีธรรมราช}}) also ''Phraya Kosathibodi'' ({{langx|th|พระยาโกษาธิบดี}}), colloquially as ''Phraya Phrakhlang'' ({{langx|th|พระยาพระคลัง}}) || frameless|upright=0.5 The Lotus Seal || Ministry of Treasury and Taxation. In later period when Siam had established trade with foreign nations the Minister also oversaw Trade and Foreign Affairs.

Known to Westerners as "Phrakhlang" or "Barcalon" and other derived terms. |- | ''Krommana'' ({{langx|th|กรมนา}}) or ''Kasettrathibodi'' ({{langx|th|เกษตราธิบดี}}) from Sanskrit ''Ksetra'' "Field" + ''Adhipati'' "Lord" || ''Phraya Phonlathep'' ({{langx|th|พระยาพลเทพ}}) || Nine different seals<ref>{{cite book |last1=Phraya Anuman Rajadhon |title=พระราชลัญจกรและตราประจำตัวประจำตำแหน่ง |date=1950}}</ref> used in different occasions. || Ministry of Agriculture. Oversaw land ownership and rice storage. |}

These four ministers were collectively called ''Wiang-Wang-Khlang-Na'' ({{langx|th|เวียงวังคลังนา}}). The ''Senabodi'' ministers of the Four Ministries held the rank of ''Phraya'' in the Ayutthaya period. However, during the late Ayutthaya and Bangkok period the ranks of these ministers rose to ''Chaophraya''.

The ''yokkrabat'' ({{langx|th|ยกกระบัตร}}) was an official of the palace administration appointed to reside in provincial towns and oversee legal affairs. It was a long-established official post of administrative importance.<ref name="KPI-Yokkrabat">{{cite web |title=ยกกระบัตร |url=https://wiki.kpi.ac.th/index.php?title=ยกกระบัตร |website=ฐานข้อมูลการเมืองการปกครอง |publisher=King Prajadhipok's Institute |language=th |access-date=11 December 2025}}</ref> Yokkrabat acted as the king's representative in legal matters, supervising adjudication and reporting on the conduct of governors and officials. In some contexts, the office functioned similarly to the head of a provincial court and a deputy to the governor.<ref name="KPI-Yokkrabat" /> During the late nineteenth and early twentieth centuries, the traditional office was gradually replaced by a modern prosecution service, and in 1916 the title ''yokkrabat'' was formally abolished and replaced by public prosecutors under the Ministry of Justice.<ref name="KPI-Yokkrabat" />

==History and subsequent amendments== The Four Ministries of ''Chatusadom'' or ''Wiang-Wang-Khlang-Na'' had existed in Ayutthaya before 1455. Each ministry was called ''Krom'' and the ministers held the rank of ''Khun''. The chancellor of the executives in Early Ayutthaya was called ''Senabodi'' ({{langx|th|เสนาบดี}} from Sanskrit ''Senapati'') who oversaw the Ministries. King Trailokanat organized and institutionalized the Four Ministries into bureaucratic apparatus in the Palatine Law of 1454.<ref name=":0" /> The Four Ministers were raised to the rank of ''Phraya'' and the Ministries were given Sanskrit-derived names. The executives was led by two prime ministers; the ''Samuhanayok'' and the ''Samuhakalahom'', who performed administrative duties on behalf of the king in Civil and Military Affairs, respectively. The officials were divided into Civil and Military divisions. However, as time progressed, the distinction between Civil and Military divisions became blurred and all official including Civil officials were expected to perform military duties especially during the wars. The two prime ministers and four ministers had their own offices and each office had a long list of functionaries.

After King Trailokanat, auxiliary departments were added to the apparatus to meet the demands. King Ramathibodi II established the ''Krom Phra Suratsawadi'' ({{langx|th|กรมพระสุรัสวดี}}) or the Registration Department in 1518 to specifically oversee the census of manpower for more efficient levy and conscription. After the conclusion of a trade treaty with the Portuguese in 1511, ''Phra Khlang Sinkha'' ({{langx|th|พระคลังสินค้า}}) or Royal Warehouse was established within the Ministry of Treasury to deal with foreign trades, in which the royal court held the monopoly. In the seventeenth century, the trade with Western nations grew and the ''Krommatha'' ({{langx|th|กรมท่า}}) or the Ministry of Pier, formerly a department within the Ministry of Treasury, rose to importance and the term ''Krommatha'' became quite synonymous with ''Krommakhlang''.

The position of ''Samuhakalahom'' had grown powerful by the mid-Ayutthaya period as he controlled military forces. ''Okya'' Kalahom Suriyawongse the ''Samuha Kalahom'' usurped the throne and ascended as King Prasat Thong in 1629. The power imbalance and potential threat from some ministers led the kings to reconsider and amend the ''Chatusadom'' bureaucracy. King Prasat Thong transferred the Cavalry and Elephant Regiments from ''Samuha Kalahom'' to ''Samuha Nayok''. Some kings preferred not to appoint ''Samuhanayok'' or ''Samuhakalahom'' to avoid creating powerful nobles, most notably King Narai, who instead assigned the duties and responsibilities of the two prime ministers to his ministers without officially investing them with titles and honors.

[[File:Kotmonthianban-kotmaitrasamduang.jpg|thumb|right|The seals of top three ministers of Siam were imprinted on the Three Seals Law, promulgated by King Rama I in 1805. Left: ''Rajasiha'' Seal of ''Samuhanayok'' Middle: ''Gajasiha'' Seal of ''Samuhakalahom'' Right: Lotus Seal of Phraklang Minister of Trade.]] The greatest reform of ''Chatusadom'' came during the reign of King Phetracha. King Phetracha, who faced rebellions in Nakhon Ratchasima and Nakhon Si Thammarat that took nearly three years to quell, sought to reduce the power of regional governors. He expanded the authority of ''Chatusadom'' to the regional level and redefined the two prime ministers. The ''Samuha Nayok'' became the Prime Minister of Northern Siam in both Civil and Military affairs while the ''Samuha Kalahom'' became the Prime Minister of Southern Siam.<ref name=":0" /> The division between the two prime ministers went from "functional" to "regional". King Phetracha also assigned the coastal port cities to the ''Krommatha''. Siam was then divided among the three ministers and the city governors were to report to the minister of their respective regions. The Minister of Trade or "Phraklang" also grown exceptionally powerful due to participation in foreign trades. By the eighteenth century in the Late Ayutthaya, three most powerful ministers of Siam were the ''Samuhanayok'', the ''Samuhakalahom'' and Phraklang the Minister of Trade.

King Borommakot, who ascended the throne in 1733 after a civil war with his nephews, transferred the cities of the ''Samuha Kalahom'' who had declared neutrality in the civil war to ''Chaophraya'' Chamnanborirak the Minister of Trade who was his ardent supporter. The Southern Siamese cities were then transferred from ''Kalahom'' to ''Krommatha''.<ref name=":0" /> The ''Samuhakalahom'' became a powerless figure. After the Fall of Ayutthaya in 1767, Thonburi and Rattanakosin kingdoms inherited the whole ''Chatusadom'' apparatus of the Late Ayutthaya period. King Rama I restored the Southern Siamese cities to the authority of ''Samuha Kalahom'' in 1782.<ref name=":0" /><ref name="Rama I">{{cite book|last1=Thipakornwongse, Chao Phraya|title=Dynastic Chronicles, Bangkok Era, the First Reign|date=1990|publisher=Centre for East Asian Cultural Studies|author1-link=Chaophraya Thiphakorawong}}</ref> The seals of top three ministers were stamped on the Three Seals Law. King Rama I who was formerly ''Chaophraya'' Chakkri the ''Samuha Nayok'' established the Chakri dynasty. The ''Samuhanayok''s of the Rattanakosin period were then not known as "''Chaophraya'' Chakkri", which was the generic title of ''Samuhanayok'', but instead known from their individualized title names, most famously ''Chaophraya'' Bodindecha.

By the late nineteenth century, the ''Chatusadom'' system was inadequate for the modernizing Siam. King Chulalongkorn and Prince Damrong gradually re-organized and transformed the ''Chatusadom'' ministries into the ministries in modern, Western sense. Firstly, the Phraklang ministry was separated into the Ministry of Finance and Ministry of Foreign Affairs in 1875. Each ministry was called ''Krasuang'' ({{langx|th|กระทรวง}}) instead of ''Krom'', which became a term for subordinate departments. The reforms culminated in 1892 when King Chulalongkorn announced the official establishment of modern Cabinet comprising twelve ministries on April 1, 1892. The ''Krom Mahatthai'' of ''Samuhanayok'' became the Ministry of Interior and ''Krom Kalahom'' became the Ministry of Defence, thus ending the ''Chatusadom'' system.

==References== <references /> Category:15th-century establishments in Thailand Category:1892 disestablishments in Siam Category:Political history of Thailand Category:Ayutthaya Kingdom