Origin of the Title 'Vatican' According to Aulus Gellius (2nd c. AD)

We have been told that the word Vatican is applied to the hill, and the deity who presides over it, from the vaticinia, or prophecies, which took place there by the power and inspiration of the god; [...]

Gellius, Aulus, Attic Nights, bk. 16, ch. 17.

(Gellius, Aulus, The Attic Nights of Aulus Gellius, trans. William Beloe, London: printed for J. Johnson, 1795, vol. 3, p. 247.)