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=== By topic === ==== Religion ==== * [[August 27]] – [[Pope Eugene II]] dies after a 3-year reign, and is succeeded by [[Pope Valentine|Valentine]] as the 100th [[pope]] of the [[Catholic Church]]. * [[October 10]] – Pope Valentine dies just after a two-month reign, and is succeeded by [[Pope Gregory IV|Gregory IV]] as the 101st pope of [[Rome]]. ==== Science ==== * [[Khalid ibn Abd al-Malik al-Marwarrudhi]] and [[Ali ibn Isa al-Asturlabi]] travel to the Plain of [[Sinjar]] (modern [[Iraq]]), under orders of Caliph [[Al-Ma'mun]], to measure the size of the [[Earth]]. ==== Agriculture ==== * The [[Saracen]]s, who found [[spinach]] originally in [[Iran|Persia]] (modern [[Iran]]), introduce the [[Annual plant|plant]] to Sicily.<ref>{{cite book|last1=Rolland|first1=Jacques L.|last2=Sherman|first2=Carol|title=The Food Encyclopedia|date=2006|publisher=Robert Rose|location=Toronto|isbn=978-0-778-80150-4|pages=335β338}}</ref> </onlyinclude>
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