The mosque of Hudavendigar is a two-story building comprising a mosque convent on the ground floor with a madrasa on the upper level. Its construction was ordered by Murad I in 1365 and completed in 1385. The ground floor is composed of a five-bav porch, a vestibule that gives access to the interior on the south and to staircases on the sides. The interior contains a main space of four iwans around a central hall and six rooms. On the upper level, there is a five-bay gallery directly above the porch, a large room beiween the two staircases, eight madrasa cells on each side and a small room above the mihmb on the south. The large room, the cells, and the corridors are barrel vaulted. All arch-openings of the gallery have a single column at their centres dividing them into two units, each topped by an arch. In the centre of the main hall there is a fountain inside a pool. The dome, which rests on a simple sixteen-sided belt on pendentives, is 11.00 m. in diameter.
The barrel vaulted and raised main iwan is also two stories high. There are barrel-vrauited two side iwans and an entrance iwan across the main iwan. Hence the mosque is a cross-axial one. Hudavendigar Mosque is constructed of stone and brick. Instead of the usual saw-toothed comice, there is one of small blind arches. All the columns and their capitaLs, as well as the marble doorjambs or heads decomted with acanthus leaves, were taken from Byzantine buildings.