The Deësis (Entreaty) mosaic, located in the upper galleries, probably dates from 1261. It was commissioned to mark the end of 57 years of Roman Catholic use and the return to the Orthodox faith. It is widely considered the finest in Hagia Sophia because of the softness of the features, the emotional realism on the faces of the figures and the tones of the mosaic. In this panel the Virgin Mary and John the Baptist (Ioannes Prodromos), both shown in three-quarters profile, are imploring the intercession of Christ Pantocrator (Christ Almighty) for humanity on Judgment Day. Typical for Christ Pantocrator representations, Christ's left hand is holding a closed book (the Gospel) while the right one is raised in blessing. The bottom part of this mosaic is badly deteriorated. The Hagia Sophia was the largest and most admired cathedral in Christianity for almost a thousand years. The current building was originally constructed between 532 and 537 on the orders of the Byzantine Emperor Justinian. The main dome collapsed during the earthquake of 558. It was rebuilt immediately, giving the building its current interior height of 55.6 meters (182 feet). The church was rededicated in 562. Over time, the Hagia Sophia suffered damage due to earthquakes, war, and neglect, and it was restored periodically. The famous mosaics were plastered over after the Ottoman conquest of 1453 and only recovered in the 20th century.