I would like to return to this extraordinary coin for a moment and consider the question, “Why Lyon?”
I recently reviewed an essay forthcoming in KOINON about another Constantine Sol coin with a rare bust type. I won’t scoop the article here, but it seems like Lugdunum/Lyon has a unique or distinctive relationship with these SOL INVICTUS issues.
Lyon struck early odd varieties of Sol striding and carrying a globe, or advancing with a whip. I speculate that Lyon might have been the first mint to strike Constantine’s SOLI INVICTO COMITI coins, but London and Trier also started striking in about 310 according to RIC. Maybe Lyon’s primacy can’t be proved.
And then we have these odd K and L bust types at Lyon—consular busts of Constantine wearing the trabea, or, as in this coin, Constantine making the imperial gestus. If there were a mint that was special to Constantine, I would assume it would be Trier. I wonder why Lyon seems to have a special relationship with this coin type, both in terms of obverse and reverse?
Just some idle speculation on a Tuesday afternoon.