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 Olympia - temple to Hera
  - statue of Zeus
  - workshop of Phidias
 Olympia (exhibition hall)
 olympiad - in Greek chronology
 Olympias - mother of Alexander the Great
  - tour through time
  - brief history
 Olympio, Sylvanus - president of Togo
 Olynthus - and mosaic floors
 O'Mahony, John - and the Fenians
 Omar - the second caliph
  - enters Jerusalem in 638
 Omar Khayyam - and his rubaiyat
  - brief description
 Omar, Mohammad - founder of the Taliban
 Ombudsman (in Britain)
 Omdurman - origin in 1884
  - battle in 1898
 Omega Workshops
 omens - in the entrails
 OMOV - and the Labour party in 1993
 omphalos - navel of the world at Delphi
 O'Murphy, Louise - and Boucher
 Oñate, Juan de - conquistador
 Ondine (ballet)
 Oneida - in the Iroquois League
 O'Neill, Conn - earl of Tyrone
 O'Neill, Hugh - earl of Tyrone
 O'Neill, Shane - rebellion against Elizabeth
 O'Neill, Terence - in northern Ireland
 O'Neills - kings of Ireland
 On Interpretation by Aristotle - and Abelard
 On-Ogur - federation of Magyar tribes
 Onondaga - in the Iroquois League
 Onslow, Arthur - Speaker
 Ontario - and the Dominion of Canada
 Onward, Christian Soldiers
 Open Championship (golf)
 open-field system - in medieval agriculture
  - brief account
 Open Spaces Society - and common land
 Open University in Britain
  - tour through time
 Opera North (company)
 opera seria - and Metastasio
 Operation Just Cause - in Panama
 Operation Restore Hope - in Somalia
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