
The history of the Philippines is known to have begun at least 709,000 years ago as suggested by the discovery of Pleistocene stone tools and butchered animal remains associated with hominin activity. Negrito groups were the first inhabitants to settle in the prehistoric Philippines. These polities were either influenced by the Hindu-Buddhist Indian religion, language, culture, literature and philosophy from India through many campaigns from India including the South-East Asia campaign of Rajendra Chola I, Islam from Arabia, or were Sinified tributary states allied to China. Much of the archipelago came under Spanish rule, creating the first unified political structure known as the Philippines. Discovery in 2018 of stone tools and fossils of butchered animal remains in Rizal, Kalinga has pushed back evidence of early hominins in the country to as early as 709,000 years. Some archeological evidence was found that humans lived in the archipelago 67,000 years ago, with the "Callao Man" of Cagayan and the Angono Petroglyphs in Rizal suggesting the presence of human settlement before the arrival of the Negritos and Austronesian speaking people. The Negritos were early settlers, but their appearance in the Philippines has not been reliably dated. The first Austronesians reached the Philippines at 3000-2200 BC, settling the Batanes Islands and northern Luzon. From there, they rapidly spread downwards to the rest of the islands of the Philippines and Southeast Asia, as well as voyaging further east to reach the Northern Mariana Islands by around 1500 BC.