‘bucks sailor went where ..?

Quite some time ago, I came across this, in Lucca:

and considered it as grossy antagonistic “Starbucks opening soon here” sign.
Later, I read up what the co. has on their own site about the logo. Which has some vague story about a 16th century Norse woodcut.
The thing being: The church (it is) in Lucca was built, and veryveryvery probably decorated, long before. So, had some Norse sailor been there? This is much more possible than latter-day non-historians tend to believe… Norsemen even had kingdoms et al. in Italy for centuries, or at least raided there quite regularly so why not? Time to dig deeper; is there really no History major who’d like to do a thesis on this? The co. we speak of, should have some nice study grant ready, right ..?

And of course there’s the research already written out here (in Italian, only just (i.e., entirely) can’t read it) about the origins of it all in the first place — the last pictures referring to the coffee you get ?? [Hm, I’m still a fan for romantic reasons, of their freshbrew]