Orhan Gazi Mosque The Orhan Gazi Mosque, situated in the heart of Adapazarı, is a rectangular cut-stone structure. The mosque underwent a renovation between 1893 and 1894, led by Adapazarı district governor Mehmet Nüzhet Pasha, which is reflected by the rebuild date inscribed on the building. However, the original date of construction, as indicated on the minaret, dates back to 1316-1318. According to Ottoman archives, the mosque was dedicated to the preacher of Beloyan Village's mosque in Sapanca. At the time of its construction in the 1320s, Ada Village had only 24 houses, and it is believed that the original version resembled Büyükesence Mosque, an example of early architecture featuring a bag technique and cradle roof. During the restoration of the Orhan Mosque, the original roof style was retained. The domeless mosque's wooden roof is covered with tiles, and the minaret underwent a redesign after being destroyed in the 1967 Mudurnu earthquake and rebuilt following the 1999 Gölcük earthquake. The walls surrounding the mosque, previously enclosed by a concrete courtyard, were dismantled and replaced with landscaping.