How often were the ancient Olympics held?

Although the ancient Games were staged in Olympia, Greece, from 776 BC through 393 AD, it took 1503 years for the Olympics to return. The first modern Olympics were held in Athens, Greece, in 1896. The man responsible for its rebirth was a Frenchman named Baron Pierre de Coubertin, who presented the idea in 1894.

They were held every 4 years just as they are now.