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...086/353360 |last1=King |first1=David A. |year=1983 |title=The Astronomy of the Mamluks |journal=Isis |volume=74 |issue=4 |pages=531–55 |s2cid=144315162}}< ...d caliphate due to [[Mongol invasions and conquests|Mongol invasions]] and the [[Siege of Baghdad (1258)|Siege of Baghdad]] in 1258.<ref name="Tahir Abbas ...