My goodness,, the term Vatican and Mons Vaticanus comes from the Phrygianum, the temple and quarters of the Galli, the eunuch-transvestite priests of Magna Mater (Cybele) they were permitted to leave on feriae and go out into the streets and tell fortunes: vatacinor. They also performed taurobolia and criobolia there. St Peter's is built over this old site and they are always finding this kind of thing; altars, inscriptions etc. The Vatican as an important cult center is attested by an inscription (CIL 131751 = ILS 4131) vires excepit ex a Vaticano transtulit. C.E. 160. Do read "A New Topographical Dictionary of Ancient Rome" L. Richardson