There's wonderful power in an ideal. My childhood visions of Camelot, where gallant knights fought for justice, "July and August cannot be too hot", and rain "never falls till after sundown", still evoke dreamy smiles. Al Andalus is another mystical world, a place where Christians, Muslims, and Jews lived in harmony, taking learning and the arts to new heights. Camelot and Al Andalus both have historical roots, Camelot in medieval Britain and Al Andalus in eight centuries on the Iberian Peninsula before Ferdinand and Isabella came to power in that famous year 1492. But history and mythology are intertwined and the lasting imprint on our moral imagination owes at least as much to myth as to reality.