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Rabirius was an ancient Roman architect who lived during the 1st and 2nd Century C.E. His designs included the massive Flavian Palace, situated on the Palatine Hill at Rome, and the Alban Villa at present-day Castel Gandolfo, both erected on a commission by his patron, emperor Domitian.
It has been suggested that Rabirius designed the extant Arch of Titus, a commemorative arch located in summa Sacra Via honoring the joint triumph celebrated by Titus and Vespasian marking their successful suppression of the Jewish Revolt in C.E. 71.
Rabirius was a 1st-century BC Epicurean associated with Amafinius and Catius as one of the early popularizers of the philosophy in Italy. Their works on Epicureanism were the earliest philosophical treatises written in Latin. Other than Lucretius, Amafinius and Rabirius are the only Roman Epicurean writers named by Cicero.
In his Academica, Cicero criticizes Amafinius and Rabirius from an elitist perspective for their unsophisticated prose style, and says that in their efforts to introduce philosophy to common people they end up saying nothing. He concludes indignantly: "they think there is no art of speechmaking or composition." Although Cicero in his writings is mostly hostile toward Epicureanism, his dear friend Atticus was an Epicurean, and this remark, occurring within a dialogue, is attributed to the interlocutor Varro, not framed as Cicero's own view.