Sultan Selim is considered the first Ottoman Caliph and arguably the greatest Sultan.
Watch this video to see why
SULTAN SELIM I, GREATEST OTTOMAN SULTAN? (First Ottoman Caliph?) [Islamic History] [Ottoman Empire] - YouTube

SULTAN SELIM I, GREATEST OTTOMAN SULTAN? (First Ottoman Caliph?) [Islamic History] [Ottoman Empire] - YouTube
Sultan Selim I 'Yavuz' (The Grim or Stern) reign is regarded as arguably the most successful of the Ottoman Sultans. Despite it being a mere 8 years (1512 - ......