The lives and loves of the great condottieri Federigo da Montefeltro, Duke of Urbino, was the archetypal 'Renaissance man': a brilliant soldier, scholar and ally of the pope, he spent much of the vast wealth on commissioning artists to decorate the city. Sigismondo Malatesta, lord of the neighbouring city of Rimini, was also a brilliant soldier and generous patron of the arts. He and Federigo were locked in an epic feud which...