How did Elis gain control of Olympia from Pisa and Pisatis?

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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 city of Elis gained control of Olympia and the surrounding region through a protracted conflict with the people of Pisa and the district of Pisatis.

While the Olympic Games were celebrated at the sanctuary on the banks of the Alpheus River, the city of Elis engaged in a long-standing struggle against the Pisatians for administrative authority over the site. This rivalry concluded in 572 BCE, when the Eleans decisively subjugated the Pisatians, securing their control over the region and the games.1