The Basilica Hilariana was a sanctuary dedicated by the cult of Cybele on the Caelian Hill in Rome, Italy, in the name of a certain M. Poplicius Hilarus and identified by an inscription in .CIL VI.641, 30973 Its vestibule was discovered in 1889 during the construction of Rome's military hospital on the Caelian Hill, the Policlinico militare Celio, along with a mosaic floor and the inscription quoted above. However, its floor plan is unknown.Rosch. II.2917‑2918; BC 1890, 18‑25, pls. I, II; 1918, 76‑78; Mitt. 1891, 109; Cons. 277 ff.
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http://penelope.uchicago.edu/Thayer/E/Gazetteer/Places/Europe/Italy/Lazio/Roma/Rome/_Texts/PLATOP*/basilicae.html