Trust in the gods, but verify -- Rome conquers Italy: methods and motives -- Hannibal's spies -- Diplomat, trader, messenger, client, spy: Rome's eyes and ears in the east -- The high price of failure: Crassus and the Parthians -- Caesar goes to Britain -- Julius Caesar and the end of the Roman Republic -- The Augustan revolution : communications and internal security -- Roman military intelligence -- Intelligence systems failure : the slaughter of Varus in the Teutoburgerwald -- Transmission and signaling -- The Roman secret service -- Big brother is watching you.

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