In what country did the Olympic Games originate?

The history of the Games goes back around 3,000 years, to the Peloponnese in Ancient Greece. Sports contests organized at Olympia took place every four years and acquired the name Olympic Games. We do not know exactly when they started, but the date of 776 BC is often cited in written sources. The exact reasons for the birth of the Games are still unknown, as history has become mixed up with mythology.

Source: Olympics