Article

The Philippine claim to Sabah

From Munshipedia, the MBRAS digital historical encyclopedia

The Philippine claim to Sabah

H.G. Tregonning, a historian of Sabah and author of A History of Modern Sabah (1960) and North Borneo (1966), published this article in 1970 in response to President Marcos’s signing of Senate Bill 954 in September 1968, which declared Philippine sovereignty over Sabah. The article systematically dismantles the Philippine claim by tracing the chain of cessions from Brunei and Sulu to the British North Borneo Company, and by demonstrating that every subsequent international agreement from 1885 to 1967 confirmed the boundary as nine miles off the Borneo coast.

Summary

Tregonning’s central argument is that the Philippine claim rests on a single disputed word—padjak—in the 1878 Overbeck-Sulu agreement, which the English version renders as “cede” but which Filipino nationalists insist meant “lease.” He rejects this reinterpretation on the grounds that the Sultan’s own subsequent conduct treated the agreement as a cession, and that no international body or government ever questioned this reading for nearly a century. The article then walks through the legal architecture that locked in the boundary: the 1885 Madrid Convention (in which Spain renounced claims to Sulu’s mainland possessions), the 1898 Treaty of Paris (setting the Philippine boundary at nine miles from the Borneo coast), the 1907 Anglo-American agreement, the 1930 Boundary Convention, and finally the 1967 Philippine Constitution itself, all of which define the Philippines’ territory without including Sabah.

A second line of argument concerns the geographic scope of the Sulu cession. Tregonning points out that the rivers named in the 1878 document are almost exclusively on the east coast of Borneo, whereas modern Sabah includes a substantial west-coast territory ceded by Brunei between 1877 and 1902—territory over which Sulu had no claim whatsoever. He also notes the absurdity that the Sibuco River, named as the southern limit of the Sulu cession, lies in present-day Indonesian Kalimantan, and that Labuan, ceded by Brunei in 1846, was never part of Sulu.

Finally, Tregonning invokes the principle of effective occupation and the 1963 United Nations Malaysia Mission, which found that the great majority of Sabahans strongly supported joining Malaysia. He closes with a pointed warning that the claim is politically self-destructive for the Philippines, noting that no other Southeast Asian state could accept such a precedent without its own borders being called into question.

Key Findings

  • The 1878 Overbeck-Sulu agreement (dated 22 January 1878, 19 Moharam A.H. 1295) ceded “all the rights and powers” over specified east-coast rivers for an annual payment of $5,000; the Brunei cession of 29 December 1877 covered four grants from Gaya Bay to the Sibuco River for $15,000 per year (pp. 163–164).
  • The Madrid Convention of March 1885, between Spain, Germany, and Great Britain, saw Spain renounce all claims to Sulu’s mainland possessions in North Borneo in exchange for recognition of Spanish sovereignty over Sulu itself (p. 167).
  • The Treaty of Paris (1898) and the Boundary Convention of 1930 both fixed the Philippine boundary at nine miles off the Borneo coast; the 1967 Philippine Constitution (Article 1) ratified this same boundary by plebiscite on 11 March 1967 (pp. 167–168).
  • The west coast of Sabah (Pangalat, Tempasuk, Putatan, Papas, Klias, Kawang, Inanam, Mengkabong, Menggatal, Api Api, Simbulan, Natas Tambalang, Kinarut, Membaku Rivers) was ceded by Brunei between 1877 and 1902 and had no connection to Sulu (p. 165).
  • The United Nations Malaysia Mission of 1963 reported that “the great majority of the people of North Borneo have strongly supported the proposed Federation of Malaysia” (p. 169, citing UN Malaysia Mission Report, para. 240).
  • The Philippine Government abolished the political powers of the Sultanate of Sulu on 22 March 1915, but the Sultan retained a pension and spiritual authority; the cession money continued to be paid annually by the North Borneo/Sabah government without default (pp. 168–169).

Conclusion

Tregonning’s definitive takeaway is that the Philippine claim to Sabah is legally and historically untenable: it contradicts every international agreement from 1885 onward, misreads the geographic scope of the 1878 Sulu document, and ignores a century of effective British and then Malaysian administration. He frames the claim as a politically motivated act that will isolate the Philippines regionally and warns that no Southeast Asian state could accept such a precedent without its own borders being destabilized.

Context

  • The article draws on the Public Record Office, London (F.O. 12/54), for the original Overbeck-Sulu treaty text and Governor Treacher’s dispatches, as well as Tregonning’s own prior publications (A History of Modern Sabah, 1960; North Borneo, 1966).
  • As a contemporary administrative historian of Sabah writing in the immediate aftermath of the 1968 Marcos declaration, Tregonning’s work functions as both a scholarly rebuttal and a piece of diplomatic advocacy on behalf of Malaysian territorial integrity.

References