Ottoman Sultan Ibrahim I
Ibrahim of the Ottoman Empire - Wikipedia

Ibrahim (/ˌɪbrəˈhiːm/; Ottoman Turkish: ابراهيم; Turkish: İbrahim; 5 November 1615 – 18 August 1648) was the sultan of the Ottoman Empire from 1640 until 1648. He was born in Constantinople, the son of sultan Ahmed I by Kösem Sultan, an ethnic Greek originally named Anastasia.[1][2][3]
He was called Ibrahim the Mad (Turkish: Deli İbrahim) due to his mental condition and behavior.[4] However, historian Scott Rank notes that his opponents spread rumors of the sultan's insanity, and some historians suggest he was more incompetent than mad.[5]
Early life
Ibrahim was born on 5 November 1615, the son of Sultan Ahmed I and his Haseki Sultan and perhaps legal wife, Kösem Sultan. When Ibrahim was 2, his father suddenly died, and Ibrahim's uncle Mustafa I became the new sultan. By that time, Kösem Sultan and her children, including young Ibrahim, had been sent to the Old Palace. After the succession of his brother Murad IV, Ibrahim was confined in the Kafes, which affected his health. Ibrahim's other brothers Şehzade Bayezid, Şehzade Süleyman and Şehzade Kasım had been executed by the order of Murad, and because of that, Ibrahim feared that he was next in the line. However, after his brother's death, Ibrahim became the Sultan of the Ottoman Empire.