Pertinax, Helvius, Roman emperor in succession to Commodus; rose from the ranks by his military services to the imperial dignity, which he was pressed to accept against his will, and was assassinated by the Prætorian Guards less than three months after, in consequence of the reforms he projected in order to restore the ancient discipline of the army (126‒193).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Perthshire * Perturbations