CIMRM 497, 498, 499, 500 - Inscriptions and coins. Santa Prisca, Rome, Italy.
CIMRM 498 is found on the left-hand side of the cult-niche, and reads:
I.e. "Born at dawn, the two Augusti Severus and Antoninus being consuls, 12 days before the kalends of December, Saturday, 18th of the moon." It indicates the date of initiation into the cult of someone, name unknown.
So it dates to November 20th, 202 A.D.1