The Isabey Mosque (İsa Bey Camii) is one of the oldest and most impressive historical mosques in Turkey, located at the foot of Ayasoluk Hill in the town of Selçuk, near the famous ruins of ancient Ephesus. Built in 1374–1375 by order of İsa Bey from the Aydınoğulları dynasty, it is an outstanding example of architecture from the Anatolian Beyliks era, a transition period between the Seljuk and Ottoman styles.

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What makes the Isabey Mosque particularly noteworthy is its asymmetrical plan and unique blend of architectural styles. Materials from the ruins of ancient Ephesus and the Temple of Artemis, including marble blocks and columns, were used in its construction. This gives the building an inimitable historical character. Originally, the mosque had two minarets, but only one, decorated with elegant brickwork, has survived to this day.
The interior of the mosque also deserves attention. The spacious prayer hall is topped by two domes of different sizes, and the courtyard with an ablution fountain is surrounded by an arcade with columns, some of which were also taken from ancient buildings. The facade of the mosque is decorated with intricate stone carvings and calligraphic inscriptions. Today, the Isabey Mosque continues to function as a religious site while also being a major tourist attraction, drawing visitors with its rich history and architectural beauty.