The library of Celsus was build over the tomb of Gaius Julius Celsus Polemeanus, the General Governor of the Asian Province, by his son and grandson in the first half of the 2nd century. The architect was Vitrouya. It was one of the most beautiful structures in the city. The facade has two-storeys. On the lower storey, the columns bear Corinthian capitals. The female statues in the niches symbolized wisdom (Sophia), knowledge (Episteme), intelligence (Ennoia) and valor (Arete), the virtues of Celsus.