Liber and Libera

Liber and Libera,  in Roman religion, a pair of fertility and cultivation deities of uncertain origin. Liber, though an old and native Italian deity, came to be identified with Dionysus. The triad Ceres, Liber, and Libera (his female counterpart) represented in Rome, from early times and always under Greek influence, the Eleusinian Demeter, Iacchus-Dionysus, and Kore (Persephone). Ovid (Fasti, Book III) identifies Libera with the deified Ariadne. At the festival of the Liberalia, held at Rome on March 17, the toga virilis was commonly assumed for the first time by boys who were of age. At the town of Lavinium, a whole month was consecrated to Liber, and the festival activities there were believed to make the seeds grow.

Liber and Libera in "Household Gods"
Happy to prayed after centuries of devotees (and their prayers) going to that "simpering Greek", Dionysus, the two gods, Liber and Libera, are more than happy to grant Nicole Gunther's wish that she could live in the days of Ancient Rome in head. The young woman lawyer had taken plaque of the two gods taken to her in Los Angeles after a tour of Carnuntum and had been holding it while thinking her wish.

The two gods, taking the wish for a real prayer, obliged by sending Gunther to ancient Carnuntum, with the body of Nicole's distant ancestress. They added the ability to speak and comprehend Latin as a bonus.