As a great master of the early Renaissance, Piero della Francesca created paintings for ecclesiastics, confaternities, and illustrious nobles throughout the Italian peninsula. Since the early twentieth century, the rational space, abstract designs, lucid illumination and naturalistic details of his pictures have attracted wide audiences. Piero's treatises on mathematics and perspective fascinate scholars in a wide range of disciplines. This Companion brings together new essays that offer a synthesis and overview of Piero's life and accomplishments as a painter and theoretician.