A palatial complex long attributed to the tenth Umayyad caliph, Hisham ibn Abd al-Malik (r. 724–743) and thus known as Hisham's Palace, is located at Khirbet al-Mafjar, about 1.5 kilometres (1 mi) north of Tell es-Sultan. This "desert castle" or "qasr" was more likely built by Caliph Walid ibn Yazid (r. 743–744), who was assassinated before he could complete the construction. The remains of two mosques, a courtyard, mosaics, and other items can still be seen "in situ" today. The unfinished structure was largely destroyed in an earthquake in 747.