Yaʿqūb b. ʿUthmān b. Maḥmūd b. Muḥammad Ghaznavī Charkhī (d. 838/1434-5 or 851/1447-8) was a shaykh of the Kh v ājagān-Naqshbandiyya brotherhood (the Kh v ājagān, lit., masters, were a network of Ṣūfīs in Central Asia often incorporated into later Naqshbandī hierarchies; the Naqshbandī Ṣūfī order, whose eponymous founder, Bahāʾ al-Dīn Naqshband, d. 791/1389, is now widespread). Yaʿqūb was born in or near Charkh, a small town between Kabul and Ghazna, in present-day Logar province, Afghanistan. His teacher in the accepted silsila