impulsor | inp- (noun M) : (), , impello
* One who incites or instigates, an inciter, instigator (rare but class.; cf.: auctor, hortator, monitor): quamvis non fueris suasor et impulsor profectionis meae, approbator certe fuisti,Cic. Att. 16, 7, 2: se auctores et impulsores et socios habuisse sceleris illius eos viros, quibus, etc.,id. Vatin. 10, 24; id. Prov. Cons. 8, 18; cf.: me impulsore,Ter. Ad. 4, 2, 21; id. Eun. 5, 6, 18: pravi,Tac. H. 4, 68.

s. TLL