Vietnam was inhabited as early as the Paleolithic age. The first known Vietnamese nation during the first millennium BC centred on the Red River Delta, located in modern day northern Vietnam. The Han dynasty annexed and put the Vietnamese under Chinese rule from 111 BC, until the first independent imperial dynasty emerged in 939. Successive imperial dynasties absorbed Chinese influences through Confucianism and Buddhism, and expanded southward to the Mekong Delta. The Nguyễn—the last imperial dynasty—fell to French colonisation in 1887. Following the August Revolution, the nationalist Viet Minh under the leadership of communist revolutionary Ho Chi Minh proclaimed independence from France in 1945.