The architect, Sinan, strengthened the buttresses and added the other three minarets during the 16th century; the structure was last renovated in the 1840s.
Sinan fortified the structure, but he didn't add any minarets or other flourishes.
mnli hypothesis: Sinan fortified the structure, but he didn't add any minarets or other flourishes. premise: The architect, Sinan, strengthened the buttresses and added the other three minarets during the 16th century; the structure was last renovated in the 1840s.