Yağ Mosque (Yağ Camii), also known as the Old Mosque, is one of the oldest and most significant historical landmarks in Adana, Turkey. Located in the heart of the Old Town, near the bustling Old Bazaar, this mosque draws attention with its rich history and unique architecture. It is an important religious and cultural site that bears witness to the region's centuries-old history.

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Architecturally, Yağ Mosque is an outstanding monument that harmoniously combines elements of Armenian and Islamic building traditions. This blend of styles clearly reflects the complex and multi-layered history of Adana, making the mosque not just a religious building but also an important cultural artifact interesting to explore.
The history of this building dates back to the 13th century. Originally, around 1250, during the time of the Armenian Kingdom of Cilicia, the Church of Saint James (Saint-Jacques) was built on this site. Later, in 1501, during the period of the Ramazanoğulları dynasty, the church was converted into a mosque, gaining a new significance and role in the life of the city. This transformation preserved many original elements, enriching them with Islamic architectural details. Today, Yağ Mosque is not only an active place of worship but also a popular attraction, drawing both believers and tourists interested in the history and culture of Adana.