Orhan Mosque and Kulliye (Center): Kulliye, which is constructed by Orhan Bey in between 1339 and 1340, is composed of mosque, theology school, charitable establishment, school, hamam and inn (Emir Inn) structures. It is on the east part of Ulu Mosque, and one of the first samples of Ottoman Kulliye.

Unique in Ottoman architecture, the two storied complex’s first floor is a mosque while the second floor is a theology school. Architecture of the structure, which has an appearance of a palace with its imposing external minaret, is not certain. Two layered forehead with upper layer porticos, opened with double steep arches with middle column aside and front, is gaining an imposing panorama reminding the Venetian palaces. Åžadırvan under the dome, whose middle part is open, creates a harmonious atmosphere with gentle splashes.

Orhan Mosque is one of the most important structures of early Ottoman period in Bursa. Twin arches at both sides are one of the most important characteristics of the structure. It was constructed with two rows of bricks and one row of stone. Brick work on its external surface is also very interesting.
Hüdavendigar Mosque and Kulliye (Center): Kulliye which was constructed by Sultan Murat I (Hüdavendigar) between 1366 and 1385 in Çekirge district, is composed of a mosque, theology school, charitable establishment, tomb and hamam.

Oposite to Hüdavendigar Mosque, there is the tomb of the Sultan Murat II (Hüdavendigar) , who died during military service in 1389 in Cassava War I . The epitaph of the tomb constructed by Yıldırım Bayezid is dated 1722.