The ancient Olympics were as much a religious festival as an athletic event. The games were held in honor of the Greek god Zeus, and on the middle day of the games, 100 oxen would be sacrificed to him. Over time, Olympia, the site of the games, became a central spot for the worship of the head of the Greek pantheon and a temple, built by the Greek architect Libon, was erected on the mountaintop. The temple was one of the largest Doric temples in Greece. The sculptor Pheidias created a statue of Zeus made of gold and ivory. It stood 42 feet (13 m) tall. It was placed on a throne in the temple. The statue became one of the seven wonders of the ancient world. As the historian Strabo put it,
… the glory of the temple persisted … on account both of the festal assembly and of the Olympian Games, in which the prize was a crown and which were regarded as sacred, the greatest games in the world. The temple was adorned by its numerous offerings, which were dedicated there from all parts of Greece.
Artistic expression was a major part of the games. Sculptors, poets, painters and other artisans would come to the games to display their works in what became an artistic competition. Poets would be commissioned to write poems in praise of the Olympic victors. Such victory songs or epinicians, were passed on from generation to generation and many of them have lasted far longer than any other honor made for the same purpose. Pierre de Coubertin, one of the founders of the modern Olympic Games, wanted to fully imitate the ancient Olympics in every way. Included in his vision was an artistic competition modeled on the ancient Olympics and held every four years, during the celebration of the Olympic Games. His desire came to fruition at the Olympics held in Athens in 1896.
Source: Wikipedia