<b>How the Italian Renaissance reinvented the power of princes by rediscovering Vitruvius and his architecture—and justified their right to rule.</b><br><br>In <i>Vitruvius: Writing the Body of Architecture</i>, Indra Kagis McEwen argued that Vitruvius’s first-century BC treatise <i>De architectura</i> was informed by imperial ideology, giving architecture a role in the imperial Roman project of world rule. In her sequel, <i>All the King’s Horses</i>, McEwen focuses on the early Renaissance reception of Vitruvius’s thought beginning with Petrarch—a political reception preoccupied with legitimating existing power structures. During this “age of princes” various <i>signori</i> took over Italian towns and cities, displacing independent communes and their avowed ideal of the common good. In turn, architects, taking up Vitruvius’s mantle, designed for these princes with the intent of making their power manifest—and celebrating “the