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Ulu Cami is the largest mosque in Bursa and a landmark of early Ottoman architecture which used many elements from the Seljuk architecture. Ordered by Sultan Bayezid I, the mosque was designed and built by architect Ali Neccar in 1396–1399. It is a large rectangular building, with twenty domes arranged in four rows of five that are supported by twelve columns. Supposedly the twenty domes were built instead of the twenty separate mosques which Sultan Bayezid I had promised for winning the Battle of Nicopolis in 1396. The mosque has two minarets.
There is also a fountain (şadırvan) inside the mosque where worshipers can perform ritual ablutions before prayer; the dome over the şadırvan is capped by a skylight which creates a soft light below, playing an important role in the illumination of the large building.
The horizontally spacious and dimly lit interior is designed to feel peaceful and contemplative. The subdivisions of space formed by multiple domes and pillars create a sense of privacy and even intimacy.

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