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Why was the Philippeum built at Olympia?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

The Philippeum at Olympia was built to commemorate the victory of Philip II of Macedon over the Greeks at the Battle of Chaeronea in 338 BCE.1

The circular Ionic order structure was begun by Philip II and likely completed by his son, Alexander the Great. Inside, the building housed gold and ivory statues of Philip, Alexander, and other members of the Macedonian royal family.1