Sāndǎo (), also known as Sanyu () and Sanshu (; ), were a collection of a prehispanic Philippine polities recorded in Chinese annals as a nation occupying the islands of (present-day Calamian), (present-day Palawan),Yang Bowen, Zhufan zhi jiaoshi (Beijing, 1996), p. 145 and (possibly Pulilan, near present-day Manila).Hugh R. Clark, Community, trade, and networks, Southern Fujian province from the third to the thirteenth century (Cambridge: Cambridge University Press, 1991), pp. 127‒132. In the Chinese Gazetteer the Zhūfān zhì 諸蕃志 (1225), they were described as tributary states of the more powerful nation of Ma-i () centered in nearby Mindoro.A Chinese Gazetteer of Foreign Lands A new translation of Part 1 of the Zhufan zhi 諸蕃志 (1225) By Shao-yun Yang (Department of History, Denison University) October 2, 2022
They described Sandao as thus:
Sandao remained tributary states of Ma-i until its territories were invaded by Sulu and Brunei marking the end of their independence.
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