Art Historians, Travelers, and Humanities Majors of Reddit: Can you help me identify the painting in these pictures I took in Rome?

I saw the painting in the Palazzo Massimo alle Terme--the section of the National Museum of Rome next to Termini Train Station--and fell in love with it. I've got roughly 4 pages of notes on it, but somehow I forgot to write the name and date of the piece down. I've googled all over the internet trying to find an inventory list for the museum, but I can't find one.

I believe it's fresco; most of which is worn away, which is why I'm so fond of it. The leftmost figure is wearing a soldier's uniform, while the other two are clothed in robes. Please forgive the poor composition of the photographs--I'm not the greatest photographer. I did, however, write a decent poem about the painting, and I'd like to be able to refer people to the painting itself, but I can't do that if I don't know the name of it.

So do your thing, Reddit: do any of you know the date/name/possible artist for this painting? It's all one painting, but I only have pictures of each individual figure, since damn near everything else is worn away or wasn't transferred off the original wall.

Album

There appears to be some problem with the album, so here are links to each picture:

1st Figure

2nd Figure

3rd Figure

tl;dr: found a painting I liked; forgot to write its name and date down.

Edit: formatting.