A birrus or birrus brittanicus was a rainproof, hooded woollen cloak (or simply a hood alone), characteristically worn in Britain and Gaul at the time of the Roman Empire and into the Middle Ages.
- William Smith, D.C.L., LL.D.: A Dictionary of Greek and Roman Antiquities, John Murray, London, 1875. quoted at  (retrieved April 29, 2008)
- T.W. Potter, Roman Britain, 2nd edition (London, The British Museum Press, 1997) quoted at the British Museum website  (retrieved April 29, 2008)
- BBC/OU Open2.net - History - Locations - Chedworth
- British Museum website (retrieved April 29, 2008)
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