Why was Darius I unable to launch a third expedition against Greece?

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Darius the Great — Darius I This chromolithograph of a frieze at Susa depicts attendants serving Darius I.

Darius I was unable to launch a third expedition against Greece because his preparations were interrupted in 486 BCE by two major events: a serious revolt in Egypt and his own death.12

Following the Persian defeat at the Battle of Marathon in 490 BCE, Darius had recognized that the conflict with Greece would require a much larger, more coordinated military effort than previous attempts. While he began organizing this grand-scale invasion, the insurrection in Egypt and his passing later that year brought these plans to a halt before they could be completed.12