The Philippines took up a claim derived from the asserted rights of the Sultan of Sulu and his heirs. Australia’s published diplomatic record identifies that connection explicitly: the heirs maintained that the territory had been leased, and the Philippine claim rested on succession to Sulu’s sovereign rights.
Why it matters
The editorial footnote traces the Philippine claim to the asserted rights of the Sultan and his heirs.
Sources & further reading
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Diplomatic record of the claim derived from Sulu
Australian Department of Foreign Affairs and Trade