Imperfect -- first person singular or (more probably) third person plural -- of the verb parenoxle/w (pi 554). Evidently extracted from somewhere -- probably Polybius 1.8.1 (web address 1: on Mamertine harassment of the Carthaginians and Syracusans in the prelude to the First Punic War), though there are also possibilities in Plutarch and Eusebius.