Based on Osip Nazaruk's story Roxolian.

In Roksolana the firstborn – Selim is born. But the laws of Fatih are such that in order to avoid internecine wars on the day of the ascension to the throne of the new tribute, all other direct heirs must be killed. And, therefore, as soon as the first son of a padiacha – Mustafa becomes a padiachah, her son will die. Through incredible intrigues, Roxolana substitutes Mustafa and Ibrahim Pasha so that they are accused of treason and Suleiman orders the execution of his son and grand vizier. Selim becomes the heir to the throne, and Roxolana is the real owner of the empire. All who loved her turned away, explaining her role in the death of Prince Mustafa. So it stays on top of power.