In 1837, the power of Daniel O'Connell's oratory focused the attention of Europeans on Ireland. They were horrified at what they saw there. The Irish poor - a third of the population - had no food except the potatoes they grew, and not enough clothing to cover themselves. They went hungry for two months of the year, and half-naked for all the year. Yet this would be their last 'good' decade before more than a million of them would vanish into unmarked graves in the 1840s. The idealistic young Baron Eotvos - a humanitarian and already a much-praised poet - struggled to understand how...