Prior to 2010, the earliest known human remains found in the Philippines were those of the pre-Mongoloid Tabon Man of Palawan, carbon-dated to around 24,000 years ago. In 2010, however, a metatarsal of Callao Man (possibly Negrito in physical type) discovered in 2007 was reported to have been reliably dated by uranium-series dating to 67,000 years ago. Negritos They were followed by speakers of Malayo-Polynesian languages who began arriving around 4000 BCE, displacing the earlier arrivals. By 1000 BCE, the inhabitants of the archipelago had developed into four kinds of social groups: hunter-gathering tribes, warrior societies, petty plutocracies, and maritime-centered harbor principalities. were among the archipelago's earliest inhabitants but their appearance in the Philippines has not been reliably dated.
