Islamic Studies
Caliphate & Rulers: From the Rightly Guided Caliphs to the Ottoman Caliphate
Which Ottoman Sultan transferred the Caliphate to Istanbul?
Explanation
Selim I (918–926 AH) conquered Egypt and transferred the title of Caliph from the Abbasid shadow caliphate in Cairo to Istanbul.
Reference: Islamic Studies - Caliphate & Rulers
, Page 10