Kheops [Khufu, building of the Great Pyramid] was succeeded by Djedefre, his oldest surviving son. The mother of Djedefre is unknown. He married his (half-) sister Hetepheres II, which may have been to legitimise his claims to the throne if his mother was one of Kheops’ lesser wives... The Turin King-list credits him with a rule of 8 years, but the highest known year referenced to during this reign was the year of the 11th cattle count. This would mean that Djedefre ruled for at least 11 years, if the cattle counts were anual, or 21 years if the...