Help with a Tombstone in Bologna!

[Flavius Promotus]

I do not think the lance is a later addition, since the width of the stone on the right of the 'arcus' is thinner than on the left side, where the lance is depicted. I think the stonemason did this on purpose to have enough space for the lance symbol.

A forger would have had to recut the right side, too, if he wanted to give this impression.

Just my thoughts...