The Mosque of Isabey
When looking down from the Church of St. John, at the entrance to the plain, which has been infilled through alluvial deposition brought by the River Cayster over the centuries, there stands the Mosque of Isa Bey. It was constructed by order of Isa Bey of the Aydınoğulları Emirate in 1375. It has a tetragonal plan, close to a square, measuring 56.53×48.68 m. In the Mosque of Isa Bey the minarets were located in the west and east corners of the actual area of worship. Today only western minaret made of bricks, remains in part, standing. Glazed bricks were used in the construction of the pedestal and in the body of both of these minarets.
Even though the eastern and northern facades of the mosque, constructed from ashlar masonry, are plain, the western front was covered with marble slabs. The portal, in the middle of the western facade, has some of the characteristics of earlier 13th century Seljuk architecture. The monumental portals was made of White and yellowish stone and surrounded by a carved moulding and the window frames draw attention with their elaborate embellishments.
The inscription (Kitabe), which was above the door and measuring 1×6 m. has been lost. There is a construction notice below the door arch and iy states “the Mosque was constucted by an architect from Damascus named Ali on the order of Isa Bey of the Aydınoğulları Beylik in 776 (H)”. On proceeding into the court from this highly decorated gate, one sees in the courtyard a polygonal water-tank with a fountain, the court surrounded by porches on three sides.The columns and the columns capitals used in the porches were reused material. It is known that the porches were covered by wooden roofs. The area where acts of worship were carried out in the mosque was reached by passing through the jagged arched three Gates, supported by small columns. This area for prayer was divided into two sections by four great granite columns. The mihrap was covered by two domes, each with a diameter of 9 m. The interior of the domes was covered in blue and turquoise glazed tiles. The marble mirhap has been restored.