Originally posted by Osiris II
A Pharaoh could have as many consorts as he liked, but only one Great Wife.
In theory yes but it didn't always work out that way in practice if you think about it.
I believe Amenhotep III gave the title 'King's Great Wife' to his daughter Sitamun while Tiye still lived. And Bintanath and Meritamun were both promoted to the rank of 'King's Great Wife' while their mothers still lived.
Bintanath was raised to the position of Great Royal wife sometime in the early second decade of her father's reign when Nefertari still lived and there is a depiction somewhere of Khamwaset along with his mother and Bintanath who are both depicted as Great Royal Wife. Of course we know that, while she still lived, Nefertari was always the most important.
Ramses III couldn't seem to work out who his Great Royal Wife was. The place in his tomb where a great royal wife would appear is, I believe, blank although Isis is known to be promnants as well as his daughter Titi who is listed as 'Mistress of the Two Lands' and 'Great Royal Wife' in her tomb. It was a son of Isis who succeeded him.
Cleopatra II and III, mother and daughter, were queens at the same time also.