Tutankhamun ruled from Memphis with the advice of officials such as the vizier Ay and the general Horemheb, both of whom succeeded him as king. Analysis of Tutankhamun's mummy suggests that he was around seventeen years old when he died, but the cause of his death is a mystery. When the young king died unexpectedly he was buried in the Valley of the Kings in what was probably intended as a non-royal tomb. This tiny tomb was discovered almost intact by Howard Carter in 1922.