Kwame Anthony Appiah in the New York Review of Books:
The conception of the Mediterranean as the meeting of three continents goes back to classical Greece. But it took a further intellectual leap to conceive of their inhabitants as a collectivity. You can have Europe, Africa, and Asia without thinking of Europeans, Africans, and Asians as particular kinds of people.
David Levering Lewis’s rich and engaging God’s Crucible shows that it took two things to make Europeans think of themselves as a people. One was the creation of a vast Holy Roman Empire by the six-foot-four, thick-necked, fair-haired Frankish warrior king we know as Charlemagne. The other was the development, in the Iberian peninsula on the southwestern borders of his dominion, of the Muslim culture of Spain, which the Arabs called al-Andalus. In the process that made the various tribes of Europe into a single people, what those tribes had in common and what distinguished them from their Muslim neighbors were both important. This is, by now, a familiar idea. But God’s Crucible offers a more startling proposal: in making the civilization that modern Europeans inherit, the cultural legacy of al-Andalus is at least as important as the legacy of the Catholic Franks. In borrowing from their great Other, they filled out the European Self.
More here.