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 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
 O'Sullivan, John - and Manifest Destiny
 O'Sullivan, Timothy - and Gettysburg
 Oswego - in French and Indian War
 Oswiu - king of Northumbria
 Otakar II - prince of Bohemia
 Othello - by Shakespeare
  - brief account
 Othman - the third caliph
 Otho - Roman emperor
 Otho - king of Greece from 1832
 Ottawa - becomes capital city of Canada
 Otto I
  - and Poland
  - brother-in-law of Hugh the Great
  - defeats Hungarians on the Lechfeld
 Otto II - Holy Roman emperor
  - and Géza
 Otto III - grandson of Otto I
 Otto of Bavaria - king of Greece from 1832
  - tour through time
 Ottoman Turks - origin
 Ottonian emperors - and manuscripts
 Ouchy - treaty of 1912
 Oueddi, Goukouni - rebel leader in Chad
 Our American Cousin - and death of Lincoln
 Ourique - battle in 1139
 Ousmane, Mahamane - president of Niger
 Ou-yang Hsiu - and poetry
  - and ancient inscriptions
 Oval (cricket ground)
 Ovambo - tribe in Namibia
  - and in Angola
 Ovamboland People's Organization - in 1958
 overglaze painting - and Kakiemon porcelain
 Overlord - codename for Normandy invasion
 'over here' (World War II)
 Overlord embroidery
 Oviedo - capital of Asturias
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