why wes olympia selected to hold at the ancient olyompic games

It would help if you proofread your questions before you posted them.

Why not? That is where they originated.

The first ancient Olympic Games can be traced back to Olympia in 776 BC. Full of blood, passion and extraordinary feats of athletic endeavour, the Olympic Games were the sporting, social and cultural highlight of the Ancient Greek calendar for almost 12 centuries.