ʿAlāʾ al-Dīn Muḥammad, the twenty-sixth Nizārī Ismaili imam and the seventh lord of Alamūt (r. 618–653/1221–1255). The only son of Jalāl al-Dīn Ḥasan (r. 607–618/1210–1221), he was born in 609/1212 in Rūdbār. ʿAlāʾ al-Dīn Muḥammad’s mother was one of the sisters of Kaykāwūs b. Shāhanshāh, the hereditary Sunni ruler of Kūtum in Gīlān (Juwaynī, 3/247–248, tr. Boyle, 2/702–703; Rashīd al-Dīn, ed. Dānishpazhūh, 176, ed. Rawshan, 173; Kāshānī, Zubda, 216; idem, Tārīkh, 57–58; Rabino, 288–289).

On the death of Jalāl al-Dīn Ḥasan in Ramaḍān 618/November 1221, his son and hei…