A narrow victory margin of only 2 percentage points in Turkey's referendum to approve sweeping constitutional changes has set the stage for President Recep Tayyip Erdogan to anoint himself as a modern-day sultan with untrammeled authority. Following in the footsteps of the 16th century Ottoman ruler Suleyman the Magnificent, and the 20th century founder of the Turkish republic Mustafa Kemal Ataturk, Erdogan has attained virtually supreme dominance to shape his country's fate.