The "King" in front of his name definitely proves that either it or the wealth that was used to acquire it was ill-gotten. All power and wealth of royalty was taken by force.

By force, true, but not necessarily illegally.

Of course not. They used force to make unjust laws that allowed them to do it. The laws of royalty are fundamentally illegitimate.

Hell, maybe an Italian goodwill in the 400's.

Yep, maybe just commissioned by a citizen of the Roman Empire living in today's Germany back when Pompeius was a general still in the news.