First inhabited in the second millennium BCE, the first archaeological record of dwellings dates from 1900 to 1600 BCE. The Kronion hill at the site was perhaps the first place of worship, dedicated to Kronos. However, other sacred buildings at the foot of the hill in the sacred grove of wild olive trees, or Altis, indicate other deities were worshipped such as Gaia, Themis, Aphrodite, and Pelops. With the descent of western Greek tribes into the Peloponnese, though, it was Zeus, father of the Olympian gods, who would become the dominant cult figure at Olympia.
In the Altis of Olympia was an Ionic circular memorial in limestone and marble, a tholos, which contained chryselephantine (ivory and gold) statues of Philip's family: himself, Alexander the Great, Olympias, Amyntas III and Eurydice I. It was made by the Athenian sculptor Leochares in celebration of Philip's victory at the battle of Chaeronea (338 BC). It was the only structure inside the Altis dedicated to a human.