The Celsos Library is one of the most beautiful buildings in the ruins of the ancient city of Pheso, its spectacular scale and beautiful sculptures are exemplary of ancient Roman architecture. The library has been damaged many times by earthquakes and fires, and what is now seen is reconstructed as it is. The library was built in around 135 AD on top of his father's tomb in memory of his father. However, Aquila died before the library was completed, and his descendants continued to complete it. The library has three doors, with the upper end of the door symbolizing wisdom, destiny, knowledge. Some people speculate that the Sersus Library is the Tirano study where the apostle Paul preached the gospel in the Bible. But the library was built later than Paul’s visit to Ephesus, so this assumption should not be true, and the Thiranu study should be elsewhere.