Hurrem was allowed to give birth to more than one son which was a stark violation of the old imperial harem principle, "one concubine mother — one son," which was designed to prevent both the mother's influence over the sultan and the feuds of the blood brothers for the throne. She was to bear the majority of Suleiman's children. Hurrem gave birth to her first son Mehmed in 1521 (who died in 1543) and then to four more sons, destroying Mahidevran's status as the mother of the sultan's only son. Suleiman's mother, Hafsa Sultan, partially suppressed the rivalry between the two women. According to Bernardo Navagero's report, as a result of the bitter rivalry a fight between the two women broke out, with Mahidevran beating Hurrem, which angered Suleiman. According to Necdet Sakaoğlu, a Turkish historian, these accusations were not truthful.