Original: There were cities in the vicinities of Beijing by the 1st millennium BC , and the capital of the State of Yan , one of the powers of the Warring States Period ( 473-221 BC ) , Ji , was established in present-day Beijing .
Simplified: The center of Beijing was settled in the 1st millennium BC . In those days , the Kingdom of Yan set up their capital where Beijing is today . They called it Ji .