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27 BCE: Augustus creates the Praetorian Guard.
2 BCE: Augustus appoints two Prefects (praefectus praetorio) to command the Praetorian Guard.
5 CE: The term of service for the Praetorian Guard is extended from 12 to 16 years.
14 CE: Sejanus becomes the praefect of the Praetorian Guard.
23 CE: The castra praetoria, permanent camp of the Praetorian Guard, is built in Rome by Sejanus.
31 CE: Sejanus, commander of the Praetorian Guard is tried and executed by the Roman Senate.
41 CE: The Praetorian Guard assassinates Roman Emperor Caligula.
193 CE: The Praetorian Gaurd assassinates Roman Emperor Pertinax.
217 CE: Macrinus, prefect of the Praetorian Guard, assassinates Caracalla and installs himself as emperor.
312 CE: Constantine I disbands the Praetorian Guard.