Archaeologists have uncovered the remains of an Abbasid-era mosque in the ancient city of Anavarza, located in Adana’s Kozan district, Türkiye. Believed to have been constructed under the reign of Caliph Harun al-Rashid, this mosque is considered potentially the earliest known mosque in Anatolia. Excavation efforts, led by Fatih Erhan from Osmaniye Korkut Ata University, revealed architectural elements such as bricks, a significant ash layer, and Abbasid ceramics, suggesting a layout similar to the Umayyad Mosque in Damascus. Historical records indicate that the mosque was destroyed in 962 by the Byzantine general Nikiforos Fokas. The discovery offers valuable insights into early Islamic architecture in the region, and restoration efforts are planned to preserve its structural elements, including the mihrab and minbar.