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When was the Heb-Sed festival celebrated for an ancient Egyptian king?

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The Heb-Sed festival was traditionally celebrated by an ancient Egyptian king after 30 years of rule, and it was repeated every three years thereafter.12

While the festival is associated with various sites, including the Step Pyramid complex at Ṣaqqārah, these jubilee ceremonies were also traditionally held in Memphis, where they were believed to reenact the unification of Egypt.12