This vision was spelled out in Maria Rosa Menocal's The Ornament of the World: How Muslims, Jews and Christians Created a Culture of Tolerance in Medieval Spain (2002) and reinforced by David Levering Lewis's God's Crucible: Islam and the Making of Europe, 570-1215 (2008). But it has deep roots. Edward Gibbon, in his famous 18th-century history of the decline and fall of the Roman Empire, wrote in glowing terms of the 10th-century Umayyad caliphate in Spain as a beacon of enlightenment, learning and urban living, at a time when Europe was plunged in bigotry, ignorance and poverty.