pridie idus octobres

rites in honour of the Penates Dei -- the Penates Dei were originally the penates who watched over the storehouse of the king (when Rome had such, obviously); at some point, the Penates Dei came to be identified with Castor and Pollux, but they still had a temple under their own name on the Velian hill which was apparently restored by Augustus.

223 A.D. -- martyrdom of Calixtus