Emperor Maxentius scepter
.... However there were no statues or figures because Numa forbade images of the gods in his temples, arguing that it was impious to represent things Divine by what is perishable.
Sounds like Numa Pompilius lifted his position regarding images of 'the gods' directly from the Ten Commandments:
...Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth. Thou shalt not bow down thyself to them, nor serve them...
I guess Mr. Pompilius was representative of those gentiles which Paul refers to in his parenthetical statement in Romans Chapter 3:
13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)
I.e., Numa Pompilius might not have had access to Scripture, nonetheless he had gleaned enough from God's handiwork to understand that you do not make images of the Divine....
"Because that which may be known of God is manifest in them; for God hath shewed it unto them."