Gevher Nesibe Sultan
Gevher Nesibe Sultan “was an early 13th century princess of the Sultanate of Rum, the daughter of Kilij Arslan II and sister of Kaykhusraw I, and the namesake of a magnificent complex comprising a hospital, an adjoining medrese devoted primarily to medical studies, and a mosque in Kayseri, Turkey. The complex (külliye in Turkish) that she endowed, is considered one of the preeminent monuments of Seljuk architecture. The hospital was built between 1204 and 1206, and the medrese, whose construction started immediately after Gevher Nesibe’s death in 1206, was finished in 1210. The complex takes its name from the princess. The medrese within is known under a variety of names: the Gevher Nesibe Medrese; the Çifte Medrese (Twin Medrese); or as the Gıyasiye Medrese, after Ghiyath al-Din Kaykhusraw I, who was responsible for its construction. The tomb within the medrese is said to belong to Gevher Nesibe.
Sutayta was taught and guided by several scholars including her father. She died in the year 377H/987CE. Sutayta did not specialize in just one subject but excelled in many fields such as Arabic literature, hadith, and jurisprudence as well as mathematics. It is said that she was an expert in hisab (arithmetic) and fara’idh (successor calculations), both being practical branches of mathematics which were well developed in her time. It is said also that she invented solutions to equations which have been cited by other mathematicians, which denote aptitude in algebra. Although these equations were few, they demonstrated that her skills in mathematics went beyond a simple aptitude to perform calculations.