Denarii of P. Plautius Hypsaeus bear the inscriptions, C. Hupsae. cos. Priver. captu., and C. Ypsae. cos. Priv. cepit (Grueber 1.476f.; 2.589f.). The cognomen Hypsaeus however does not appear in the consular lists until 125 B.C. (See Cesano, Stud. Num. 1.150f.) Plautius' cognomen (his name is preserved entire in Act. Tr.) distinguishes him from the Consul of 341 and the Censor of 312 (Degrassi 108, 541). (Broughton MRR I)
Liv. 8.20.3; Chr. 354 (Privernas II et Declao); Fast. Hyd. (Mamertino II et Deciano), so also Chr. Pasc.; Cassiod.; Degrassi 34f., 108, 412f. The Consuls reduced Privernum to surrender, celebrated triumphs, and moved to give the town favorable terms and citizenship (Liv. 8.20-21; Act. Tr., Degrassi 68f., 541; Val. Max. 6.2.1; cf. Dio fr. 35.11). On Plautius, see Lübker no. 5. (Broughton MRR I)
The evidence quoted above shows that the ancient sources admit of four different identifications for Plautius and two for Cornelius. Plautius may be C. Plautius P. f. P. n. Proculus, Cos. 358, or perhaps a son, P. (or C.) Plautius C. f. P. n. Proculus, not otherwise known. But the authorities based on Fast. Cap. point either to Decianus, Cos. 329 (Chr. 354) or to C. P. Venno or Venox, possibly a brother of the Consul of 330. No choice is certain; but in view of the general priority to be given to Livy's lists I have listed Proculus above. Likewise, no clear choice is possible between Cornelius Scapula and Cornelius Scipio Barbatus, who would then be an uncle of the Consul of 298 and uncle or father of the Pontifex mentioned in 304, -if he was not in fact the Pontifex himself. See Münzer, RE nos. 315 and 316; and on the Plautii, Lübker, nos. 5, 11, and 18. (Broughton MRR I)
Liv. 8.22.1 (P. Plautio Proculo P. Cornelio Scapula); Diod. 17.87.1 ({Gr}); Chr. 354 (Deciano II et Barbato); Fast. Hyd. (Venoce II et Scipione); Chr. Pasc. ({Gr}); Cassiod. (C. Plautius et P. Cornelius); Degrassi 108, 412f. A colony was sent to Fregellae (Liv. 8.22.1-2). (Broughton MRR I)