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When did the first controlled excavations at Olympia take place?

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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 first controlled excavations at Olympia took place in 1829. These excavations were conducted by the French Expédition Scientifique de Morée, led by Abel Blouet, and focused on the Temple of Zeus.1