Built around the year 104, it is one of the most important monuments of Ephesus. It was built in honor of Emperor Trajan, so his statue appeared in the central niche of the facade, overlooking the pool.
The pool of the fountain was 20 x 10 meters, surrounded by columns and statues of Dionysus, Satyr, Aphrodite and the family of the emperor, now displayed in the Ephesus Museum. The restoration has not been completed yet.