The first Austronesians reached the Philippines at around 2200 BC, settling the Batanes Islands and northern Luzon from Taiwan. From there, they rapidly spread downwards to the rest of the islands of the Philippines and Southeast Asia. This population assimilated with the existing Negritos resulting in the modern Filipino ethnic groups which display various ratios of genetic admixture between Austronesian and Negrito groups. Genetic signatures also indicate the potential migration of Austroasiatic, Papuan, and South Asian people. Jade artifacts have been found dated to 2000 BC, with the lingling-o jade items crafted in Luzon made using raw materials originating from Taiwan. By 1000 BC, the inhabitants of the archipelago had developed into four kinds of social groups: hunter-gatherer tribes, warrior societies, highland plutocracies, and port principalities.