The Yeşil Cami (‘Green’ mosque, because of the predominant colour of its tiles inside) is the most decorated of the city’s houses of prayer. Built for sultan Mehmed I Çelebi (1389-1421) by the architect Hacı Ivaz Paşa, who was also an army commander and a vizier; he is the architect of the Yeşil Türbe (mausoleum) too. The mosque’s building was completed in 1419, its inner decoration in 1424.

On the picture: The north facade with the main entrance and its open loggias on the first floor.
The mosque is built out of sandstone and clad with marble panels, a majority of which was replaced in the mid-19th century, when the building underwent an extensive renovation led by the French architect Léon Parvillée, as Ahmet Vefik Paşa, the Vali (governor) of Bursa, was unable to find a qualified Turkish architect.
The two minarets (one not visible on this picture) date from that restoration too; they are in late-Ottoman style.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Vakıf Abideler ve eski Eserler III’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia,