This detailed biography of a man who flourished in two very different worlds opens a new doorway into the societies of prerevolutionary France and postrevolutionary Georgia. Christophe Poulain DuBignon (1739-1825) was the son of an impoverished Breton aristocrat. Breaking social convention to engage in trade, he began his long career first as a cabin boy in the navy of the French India Company and later as a sea captain and privateer. After retiring from the sea, DuBignon lived in France as a "bourgeois noble" with income from land, moneylending, and manufacturing.

Uprooted by the French...