The Greek gods lived high atop Mt. Olympus, which allowed them to watch what went on in the human realm below and intervene as they saw fit. They insisted on being properly worshipped by humans, but otherwise tended to treat the affairs of these weak and short-lived creatures almost like a sport. So Olympian describes someone who seems "lofty" and "above it all", as if surveying a scene in which other people appear the size of ants. The Olympic Games were first celebrated in the 8th century B.C., at the religious site called Olympia (far from Mt. Olympus), and Olympian today actually most often refers to Olympic athletes.