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On the sign:
Civil War - Parliamentarian prisoners are held in St Georges Tower 1643 OXFORD PRESERVATION TRUST
Station No. 9 in the historic Oxford Castle route, consisting of 14 plaques depicting landmarks on the site from 700 AD to 2006
In the first civil war (1642-1646) which broke out between parliamentary and royal supporters, Oxford was the capital of royal supporters. As part of the battles, Parliamentary inmates were held at St Georges Tower.