Literatuur

• N. J. E. Austin , Exploratio, Military & Political Intelligence in the Roman World from the Second Punic War to the Battle of Adrianople (eBook), [2002], p. 55-59, 62,
• Michael P. Speidel , Riding for Caesar, Roman Emperor's Horseguards, [1997], ,
• - - , Algemeen, , The Ultimate James Bond Resource!
• - - , Algemeen, , Roman Army Talk: Executing John the Baptist

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