Thutmose III was an Egyptian pharaoh, as well as the father of Amenhotep II and the grandfather of Erimem. (AUDIO: The Roof of the World) He was also a man from the far future, somehow made flesh in a man thousands of years earlier.
He ruled his people with wisdom and kindness, and fought his enemies with a mighty sword and lion's courage. (PROSE: The Three Faces of Helena) In his youth Thutmose faced Ash-Ama-Teseth, and imprisoned him with his blood. (PROSE: The Last Pharaoh)
When Erimem tried to stop Ibrahim Hadmani's death several times on an ice planet, each attempt resulted in a new way for him to die. Her grandfather came to her in a dream and after she was able to go back in time and prevent Ibrahim from going to the ice planet in the first place. (PROSE: The Snow Wolves)
Thutmose showed Erimem a variety of possible pasts and futures. The lesson he wished to impart to her was that time was fragile, and that if she had to change the past, she should only do it once. Any more times would cause irreparable damage to time. He used her changes to time on the ice planet as an example. Erimem said that she understood, and Thutmose expressed his hope that she did. (PROSE: Echoes)
Thutmose visited Erimem when she walked the tomb of her father after his death. The tomb threw many challenges at Erimem, yet when she was told to surrender, she stood and fought the apparitions that attacked her. Thutmose told her that she had an important place in history, and had to take the position of pharaoh, albiet briefly, otherwise history would change and the universe would be torn apart. He then erased her memory of what had transpired in the tomb.