Who was the first Ottoman Sultan to also be known as the Caliph?

The Ottoman Empire was founded by Osman I in 1299 and lasted until its dissolution in 1922. Throughout its history, the Ottomans were known for their military strength, cultural advancements, and political prowess. The first Ottoman Sultan to also be known as the Caliph was Sultan Selim I, who ruled from 1512 to 1520.

During his reign, Selim I conquered the Mamluk Sultanate of Egypt and established the Ottoman Caliphate, which made him the spiritual leader of the Islamic world. The title of Caliph, which means 'successor' in Arabic, was traditionally used to refer to the leader of the Muslim community after the death of Prophet Muhammad.

Selim I was known for his military campaigns and expansion of the Ottoman Empire, but his establishment of the Caliphate cemented the Ottomans' status as a major Islamic power. Following his death, Selim I was succeeded by his son Suleiman the Magnificent, who is often considered one of the greatest Ottoman rulers in history.