[Claud]

There is an entire 1st century necropolis under the Basilica. Almost all the tombs are from the era of Peter. Sol Invictus was a late cult...it wasn’t started until the mid-200s. Most of the tombs down there have nothing to do with Sol Invictus...except that tomb M has a mosaic which has been interpreted as such, even though it could just be Christ as the sun.

[redgolum]

No, Sol Invictus dates earlier than that. It wasn’t very popular till the 200’s or so, but there are inscriptions relating to it for much of Rome’s pagan past.