Princess Fawzia Fuad, a daughter of Egyptian kings and the first wife of the last Shah of Iran, died on Tuesday in Alexandria.
Her death at the age of 91 was also reported on a Facebook page associated with her nephew, King Fuad II, Egypt's deposed and exiled last monarch.
Fawzia, the sister of Fuad's father King Farouk, married Mohammad Reza Pahlavi in 1939, before he acceded the throne in Tehran. They divorced nine years later.
Afterwards, Fawzia married an Egyptian army officer. She was one of a few royal family members who continued to live in Egypt after the 1952 revolution.
"In all the years I knew her I never heard her complain, and, God knows, she had many reasons to," said Princess Melekper Toussou.
"The royal family of Egypt announces to the nation that it is mourning the passing of Her Royal Highness Princess Fawzia Fuad, daughter of His Majesty King Fuad I and sister of His Majesty King Faruk I and aunt of his Majesty King Fuad II and the former Empress of Iran," read a statement on the Facebook page.
"The funeral procession for Her Royal Highness Princess Fawzia will start after noon prayer on Wednesday," it added. She will be buried in Cairo.
The Shah went on to marry twice more and died in Cairo in 1980, less than a year after he was deposed in the Islamic revolution.
