Historical Treaties of Southeast Asia

A research program in global diplomatic history

Historical Treaties of Southeast Asia is a collaborative research program in Global Diplomatic History financed by the Swedish Research Council and running from 2022 until the end of 2027.

A team of seven researchers based in Europe and Southeast Asia investigate the role of treaties and treaty-making in the imperial expansion and colonisation of Southeast Asia from the eighteenth to the early and twentieth century.

The researchers systematically analyse all bilateral treaties concluded between a European, American or Japanese imperial power and a Southeast Asian polity between the eighteenth and early twentieth century. In addition, a selected number of diplomatic treaty-making processes are studied in detail. In doing so, the project aims to bring about a new and more nuanced understanding modern imperialism of relevance not only to Southeast Asia but globally.

 

Project Member Ariel Lopez Featured in New Historical Documentary

Project member Ariel Lopez appears in a new documentary

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Treaties and Origins of the Cambodia-Thailand Border Dispute

Ever since Cambodia became independent in 1953, its border with Thailand has been contested, the ancient Hindu temple Preah Vihear (or Phra Wihan in Thai) being a particular source of discord. To understand the present conflict, it is necessary to look at two treaties concluded in 1904 and 1907.

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05
Mar
International Institute of Social History, Nikolaevsky room.
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Amsterdam
Maarten Manse at GLOBALISE Conference on VOC Archives, Amsterdam, 4–6 March 2026

19
Mar
Maarten Manse and Birgit Tremml-Werner present on colonial archives in Vienna, 19–20 March

23
Mar
Maarten Manse, Hans Hägerdal and Santy Kouwagam present on Dutch legal language at Oxford, 23 March

25
Mar
Centre for South East Asian Studies, School of Oriental and African Studies, London (exact venue TBA)
Guest lecture on treaty-making and cross-cultural diplomacy in Southeast Asia, 18th–20th centuries.

02
Apr
Manse presents his forthcoming book on colonial taxation and governance at KITLV, Leiden, 2 April

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