Qasr al-Hayr al-Sharqi (Arabic: قصر الحير الشرقي, lit. 'Eastern al-Hayr Palace or the "Eastern Castle"') is a castle (qasr) in the middle of the Syrian Desert. It was built by the Umayyad caliph Hisham ibn Abd al-Malik in 728-29 CE in an area rich in desert fauna. It was apparently used as a military and hunting outpost. The palace is the counterpart of Qasr al-Hayr al-Gharbi, a nearby castle palace built one year earlier. It is one of the so-called desert castles.
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