This volume contains the texts of six papers delivered by internationally renowned scholars during a three-day conference held in Florence in October 2008 in celebration of the one hundredth anniversary of the publication of Horne’s celebrated monograph on Botticelli. The first paper, by Caroline Elam, is the keynote lecture she gave at Villa I Tatti about Horne’s remarkable personality and career. Another, by Jonathan Nelson, poses the equally fundamental question of what constitutes authorship in certain works in the production of which Botticelli was only partly involved. Scholar Antonella Francini presents a poem she just discovered by Herbert Horne about a portrait by Botticelli in London. Together these essays deepen our understanding of this celebrated early Renaissance painter.