Four exquisite works of art, made especially for private devotional purposes, together with an outstanding new study by Professor James R. Banker, underline the importance of Piero della Francesca as one of the pre-eminent artists of Renaissance Italy. Neglected for four centuries, the surviving paintings of Piero della Francesca are today regarded as sublime masterpieces, with the artist himself seen as central to the flowering of Renaissance art, and equal in importance to Leonardo da...