Decorative lintel with hieroglyphs identify king Senusret III wearing the crown of Lower Egypt (left) and the crown of Upper Egypt (right) during the Heb Sed.
Sed festivals were jubilees celebrated after a ruler had held the throne for thirty years and then every three to four years after that. They primarily were held to rejuvenate the king’s strength and stamina while still sitting on the throne, celebrating the continued success of the king.
Middle Kingdom, 12th Dynasty, reign of Senusret III, ca. 1878-1839 BC. From Medamud. Now in the Egyptian Museum, Cairo. JE 6189