Şehzade Kasım was born in 1614 in Topkapı Palace to Ahmed I and Kösem Sultan. Following his father’s early death in 1617, he, along with his mother and brothers, were banished to the Old Palace (Eski Sarayı).
After Murad’s accession in 1623, Kasım was confined in the Kafes, which was the part of the Imperial Harem where possible successors to the throne were kept under a form of house-arrest and constant surveillance by the palace eunuchs.[3][4]
Efforts to save Ibrahim from execution
According to the Turkish historian Necdet Sakaoğlu, during Murad IV’s chaotic reign, Kasım hid and protected his younger brother, Ibrahim, in secret parts of the palace by portraying him as innocent and incompetent.[5]
Death
During the celebrations of the Ottoman victory at Erivan in 1635, his brothers Bayezid, Selim and Süleyman were executed, leaving Kasım as the heir apparent to the Ottoman throne.
On 17 February 1638, Kasım was terrified of arousing any suspicion that he had designs on the throne. Thus he was all humility when he presented himself before Murad to pay his respects and wish him success on his expedition to reconquer Baghdad.[6]Murad accepted Kasım’s wishes, and then on that same day, Murad ordered his execution.[2]
The execution of Kasim was the last case of fratricide in the Ottoman dynasty, after which the Law of Fratricide fell into disuse and was definitively replaced by agnatic seniority as a law of succession.
In popular culture
In the television series Muhteşem Yüzyıl: Kösem, Kasım is played by Turkish actor Doğaç Yıldız.
References
^Singh, Nagendra Kr (2000). International encyclopaedia of Islamic dynasties (reproduction of the article by M. Cavid Baysun "Kösem Walide or Kösem Sultan" in The Encyclopaedia of Islam vol V). Anmol Publications PVT. pp. 423–424. ISBN81-261-0403-1. Through her beauty and intelligence, Kösem Walide was especially attractive to Ahmed I, and drew ahead of more senior wives in the palace. She bore the sultan four sons – Murad, Süleyman, Ibrahim and Kasim – and three daughters – 'Ayşe, Fatma and Djawharkhan. These daughters she subsequently used to consolidate her political influence by strategic marriages to different viziers.