Fatma was born circa 1559 during Selim's princedom, at
Konya where he served as
sanjakbey, or provincial governor, at the time. She was her father's youngest daughter. Her mother's identity is uncertain. It was earlier disputed whether she was the daughter of
Nurbanu Sultan but considering that Nurbanu accompanied her son, Murad to his province to which he was appointed by his grandfather,
Suleiman the Magnificent in 1558 and Fatma was born in 1559, Peirce had debunked this possibility. That Fatma was born with an unknown concubine is further proved by the provision made by her for her mother for 40 aspers, which was definitely not required by a woman paid 1,100 aspers by the end of Selim II's reign as
haseki sultan and 2,000 aspers in her son, Murad III's reign as
valide sultan and who had died in 1583, predating Fatma's will. ==Marriage==