Jonathan Steinberg is the Emeritus Walter H. Annenberg ­Professor of European History at the University of Pennsylvania and Emeritus Fellow of Trinity College, Cambridge. His most recent books are Bismarck: A Life and the third edition of Why Switzerland?
 (December 2018)

IN THE REVIEW

An Exile at Home

The Pope Who Would Be King: The Exile of Pius IX and the Emergence of Modern Europe

by David I. Kertzer
David Kertzer has written a number of important books on modern Italy, including The Pope and Mussolini: The Secret History of Pius XI and the Rise of Fascism in Europe, which won the Pulitzer Prize for biography in 2015.* In 1997 he published The Kidnapping of Edgardo Mortara, the …