While most Ancient Egyptians were monogamous, the pharaoh would have had other, lesser wives and concubines in addition to the Great Royal Wife. This arrangement would allow the pharaoh to enter into diplomatic marriages with the daughters of allies, as was the custom of ancient kings.
In the past the order of succession in Ancient Egypt was thought to pass through the royal women. This theory, referred to as the Heiress Theory, has been rejected ever since the 1980s and is now not accepted by Egyptologists. The throne likely just passed to the eldest living son of the pharaoh. The mother of the heir to the throne was not always the Great Royal Wife, but once a pharaoh was crowned, it was possible to grant the mother of the king the title of Great Royal Wife, along with other titles. Examples include Iset, the mother of Thutmose III, Tiaa, the mother of Thutmose IV and Mutemwia, the mother of Amenhotep III.
A special place in the history of great royal wives was taken by Hatshepsut. She was Great Royal Wife to her half-brother Thutmose II. During this time Hatshepsut also became a God's Wife of Amun (the highest ranking priestess in the temple of Amun in Karnak). After the death of her husband, she became regent because of the minority of her stepson, the only male heir (born to Iset), who eventually would become Thutmose III. While he was still very young, however, Hatshepsut was crowned as pharaoh and ruled very successfully in her own right for many years. Although other women before her had ruled Egypt, Hatshepsut was the first woman to take the title, pharaoh, as it was a new term being used for the rulers, not having been used before the eighteenth dynasty. When she became pharaoh, she designated her daughter, Neferure, as God's Wife of Amun to perform the duties of a priestess. Her daughter may have been the great royal wife of Thutmose III but there is no clear evidence for this proposed marriage.
Elsewhere, in Kush and other major states of ancient Africa, the rulers often structured their households in much the same way as has just been described. This practice has continued to the present day, with the most senior polygamous spouses of contemporary African royals often being referred to by the honorific Great Wife.
Received the title from her son Thutmose IV after her husband's death - Amenhotep II tried to break the royal lineage by not recording any of his wives, who may not have been royal, and Tiaa was identified only later, by her son