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The Rüstem Pasha Mosque was designed by Ottoman imperial architect Mimar Sinan for Grand Vizier Damat Rüstem Pasha (husband of one of the daughters of Suleiman the Magnificent, Princess Mihrimah). Its building took place from 1561 to 1563.
The Rüstem Pasha Mosque is famous for its large quantities of exquisite Iznik tiles, set in a very wide variety of beautiful floral and geometric designs, which cover not only the façade of the porch but also the mihrab, minbar, walls, columns and on the façade of the porch outside. No other mosque in Istanbul makes such a lavish use of these tiles.
The plan of the building is basically that of an octagon inscribed in a rectangle. The main dome rests on four semi-domes; not on the axes but in the diagonals of the building. The arches of the dome spring from four octagonal pillars— two on the north, two on the south— and from piers projecting from the east and west walls. To the north and south are galleries supported by pillars and by small marble columns between them.
(Source: Wikipedia)