The word for "rich" in most Romance languages looks something like, well, "rich". It declines like a first/second declension adjective, and seems to go back to Germanic *rīkijaz (possibly through Gothic reiks, cognate with Latin rex "king").
In Classical Latin, I'd normally use an adjective like dīs to mean "rich". But I'm curious if something like *rīcus is ever attested (even in graffiti or other Vulgar sources).
I can think of plenty of attestations of Spanish, Italian, Portuguese, and so on, but I'm looking specifically for Latin usage—as a rule of thumb, I'd like it to be closer to *rīcus than rico.