A person named Mehmed Agha converted the masjid into a mosque by putting a mihrab in the masjid.
In 1688, Şeyh Şükrü Mehmet Uşşaki had appointed a sheikh to a masjid, thus turning it into a Uşşaki zawiya; however, these designations was cut off in the 18th century.
The restoration date is 1902/1903 on the verse plate above the door.
It was repaired in 1902 and 1945.
It was last renovated by Ata Köseoğlu in 1955.
- Prominent features
The mosque is also known as “Alaca Masjid”, “Ketenciler Masjid” and “Çelebioğlu Alauddin Masjid”.
Its mihrab is completely covered with tiles.
The minbar and the pulpit are wooden; there are two floors of galleries on top of each other.
From the first gallery, which is in the form of a mezzanine, stairs lead to the upper gallery.
The upper gallery completely covers the top of the main prayer area. • The mosque is built of masonry.
The mosques single-balcony minaret (it is the only original architectural element that has survived to the present day) is located at the back of the mosque and has an interior area of 180 m².
There are two stairs going up from the side of a narrow entrance at the end of the wide entrance; one of these stairs is old and the other is new.
The marble railings of the middle staircase are remains from the first structure.
Its benefactor Çelebioğlu Hoca Alaaddin is buried in front of the mihrab.