1. A Roman historian, a contemporary of Cicero. He appears to have written on early Roman history, as Varro quotes his account of the origin of the Curtian lake. and likewise on later Roman history, as Pliny refers to him respecting Pompey's triumph on his return from Africa (Varr. L. L. 5.148, comp. 5.154, ed. Müller; Plin. Nat. 8.2). He was held in high estimation by Atticus, but Cicero writes that Dicaearchus was far superior to him, from which we may infer that Procillius wrote likewise on geographical subjects. (Cic. Att. 2. § § 2.)