Hasan Çelebi

Hasan Çelebi (Hasan Chalabī), believed to be Circassian, was the slave and eventually the adopted son of Ahmed Karahisârî (1468–1556), the famous calligrapher of the period of Sultan Süleyman (r. 1520–1566), and sometimes signed his works as such. Other times, he signed his works as "son of Abdullâh," using the generic patronymic for slaves and converts. He continued in his master's style, which was a later adaptation of the style of Yāqūt al-Mustaʿşimī (d. 1298), which fell into disuse with the death of Hasan Çelebi in or after 1594. He completed the calligraphic inscriptions of the Süleymaniye Mosque in Istanbul after the death of Karahisârî in 1556. He is also responsible for the calligraphic inscriptions on the Selimiye Mosque in Edirne. His works are extremely rare and highly prized.