Haci Bayram Mosque is located in the Ulus section of Ankara next to the Augustus temple.
Originally built in 831 H (1427/28), the mosque as it stands today shows the characteristics of late 17th century and 18th century mosques.
It has a lengthwise rectangular plan and the sections at north and west are later additions.
At the south east wall of the mausoleum, there is a two - gallery minaret with a square plan, stone base and brick body.
There is an inscription of Word of the God (Kelime-i Tevhid) in large Arabic calligraphy (sülüs) on the protrouting southern wall of the late-comer's section.
Single interior space is covered with a wooden ceiling. The hexagonal large rosette in the centre of the ceiling is framed with six rows of flowered borders. The same rosette in smaller scale can be seen on the central rectangular panel of the ceiling of the annexed section west to the women's section. The edges of the ceiling of the inner space of the mosque are decorated with flower patterned cornices. The same type of cornices are also used in the women's section.
The lower windows of the mosque are rectangular and have iron grids. On the exterior they are bordered with niches with pointed arches. Upper windows are pointed arched, have plaster gratings and stained glass and bordered with chiselled plant motives.
On the interior, Kütahya tiles are placed up to the top of the windows. After the tiles, transition to plain wall is made with a border of chiselled palmette.
The plaster Mihrab is built with a moulding technique and is in the form of stalacti niched. Pieces from Koran are inscribed in five rows on the pediment of the Mihrab
The Word of God can be seen on Mihrab borders as decoration. Colored Mimbar is made with false "kündekari" technique and displays a fine workmanship.
The painted engravings on wood are made by the engraver Nakkas Mustafa. Two inscriptions on kible side indicate that the mosque was restored in 1714 by one of the grandsons of Haci Bayram-i Veli, Mehmet Baba.
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