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 Orkneys - and the Vikings
  - in the Scottish kingdom
  - brief account
 Orlando Furioso - by Ariosto
 Orlando Innamorato - by Boiardo
 Orlando the Marmalade Cat
 Orleanists - and the July monarchy
 Orléans - siege of 1428-9
  - and Joan of Arc
 Orléans, duke of - and John the Fearless
 Orléans, duke of - and Mississippi Bubble
 Orléans, duke of - as Louis Philippe
 Orléans, Philippe - and Molière
 Ormazd - version of Ahura Mazda
 Oroonoko - by Aphra Behn
 Orsanmichele - and Donatello
 Orsini - Roman family
 Orso - the first Venetian doge
 Ortega, Daniel - president of Nicaragua
 Orton, Arthur - Tichborne Claimant
 Orton, Joe
 Ortus Medicinae - by van Helmont
 Orvieto - cathedral façade
 Orwell, George
 Osaka - castle in 1583
 Osama bin Laden
 Osborne, John
 Osborne House
 Oscar I - king of Sweden and Norway
 Oscar II - king of Sweden and Norway
 Oseberg - Norwegian ship burial
 Ösel - ceded by Denmark to Sweden
 O'Shea, Kitty - and Parnell
 Osiris - Egyptian god
  - restored by Isis
 Osman - and the Ottoman Turks
 Osnabrück - and peace of Westphalia
 Ospedale degli Innocenti - Brunelleschi
 Ospedale di Santa Spirito - founded in Rome
 Ossian - and Macpherson
  - brief account
 Osterley Park, London
 Ostia - early Roman colony
 Ostmark - Austria in 1938
 ostracism - in Athens
 ostrich - domesticated
 ostrich feathers - in African trade
 Ostrogoths - 3rd century AD
  - and Arianism
  - invade Italy
  - and Sicily
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