Sultan Ahmed Mosque
From 1609 until 1616 he worked exclusively on the Sultan Ahmed Mosque, called the Blue Mosque because of the colour of its tile work. The design of the mosque was based on the Hagia Sophia (Church of Holy Wisdom), the masterpiece of Byzantine architecture built in the 6th century, and on the work of his master, Mimar Sinan. The design of the mosque is perfectly symmetrical, with a great central dome buttressed by four semi-domes and surrounded by a number of smaller exedrae.