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 also remodeled part of the interior, making it more ornate.
mnli hypothesis: Sinan also remodeled part of the interior, making it more ornate. 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.