Tutankhamun became pharaoh at age nine and was taught to rule by his advisor Ay. He later married Ay's granddaughter. Tutankhamun supposedly died in a chariot accident, but it was possibly not an accident. After Tutankhamun's death, Ay and then Horemheb succeeded him as pharaohs, with some believing Horemheb orchestrated Tutankhamun's death to gain the throne.