The Sultanahmet Camii (called the Blue Mosque by the West), was built in 1609 and completed in 1616 by order of the Sultan Ahmet I, Sultan of the Ottoman Empire and Caliph of Islam. The Sultan Ahmet ascended the throne at the age of 14, and died of typhus a year after the completion of the Mosque at the age of 27. The architect was Sedefhar Mehmet Ağa.

One of the most notable features of the Blue Mosque is its six minarets. It is believed that the Sultan directed his architect to make gold (altin) minarets, which was misunderstood as six (alti) minarets. This was considered pretentious because the mosque in Mecca likewise had six minarets, and therefore the Sultan Ahmet had a seventh minaret added to the mosque in Mecca. — Wikipedia