Pomponia
the wife of A. Plautius, was accused in the reign of Claudius of practising religious worship unauthorised by the state; but her husband Plautius, who was allowed, on account of his victories in Britain, to judge her, in accordance with the old Roman law, declared her innocent. She was probably the daughter of P. Pomponius Graecinus, consul suffectus A. D. 16. She was related to Julia, the daughter of Drusus, and granddaughter of Pomponia, the daughter of Atticus; and she lived forty years after the death of Julia, who was executed by Claudius at the instigation of Messalina. (Tae. Ann. 13.32.)
a Vestal virgin in the reign of Caracalla, put to death for violation of her vow of chastity. (Dio Cass. Ixxvii. 16.)
plebeian. Towards the end of the republic the Pomponii, like other Roman gentes, traced their origin to the remote times of the Roman state. They pretended to be descended from Pompo, one of the alleged sons of Numa (Plut. Num. 21); and they accordingly placed the image of this king upon their coins. In the earliest times the Pomponii were not distinguished by any surname; and the only family that rose to importance in the time of the republic was that of MATHO ; the first member of which who obtained the consulship was M. Pomponius Matho in B. C. 233. On coins we also find the cognomens Molo, Musa and Rufus, but these surnames do not occur in ancient writers. The other cognomens in the time of the republic, such as Atticus, were not family names, but were rather descriptive of particular individuals. An alphabetical list of them is given below, as well as of the cognomens in the imperial period, which were rather numerous. (Comp. Drumann, Geschichte Roms, vol. v. p. 1, &c.)
(1) The sister of T. Pomponius Atticus, and wife of Quintus Cicero, the brother of the orator. He divorced her in B.C. 45.
(2) The daughter of T. Pomponius Atticus, also called Caecilia and Attica. She was married to M. Vipsanius Agrippa, and her daughter, Vipsania Agrippina, married Tiberius, the successor of Augustus.