In 1944 the political philosopher and refugee, Hannah Arendt wrote: 'Everywhere the word 'exile' which once had an undertone of almost sacred awe, now provokes the idea of something simultaneously suspicious and unfortunate.' Today's refugee 'crisis' has its origins in the political-and imaginative-history of the last century. Exiles from other places have often caused trouble for ideas about sovereignty, law and nationhood. But the meanings of exile...