Tughra (i.e., seal or signature) of Suleiman I (known as Suleiman the Magnificent or the Lawgiver), Sultan of the Ottoman Empire (1520-1566). An explanation of the different elements composing the tughra can be found here.
Tughra_of_Suleiman_I_the_Magnificent.JPG
Tughra_of_Suleiman_I_the_Magnificent.JPG: Unknown court calligrapher.
derivative work: Alberto Fernandez Fernandez (talk)