The Redheaded Master of the Early Renaissance In the vibrant, competitive atmosphere of the early 15th-century Italian Renaissance, few figures possess a legacy as intriguing yet enigmatic as Nanni di Bartolo. Known to art historians by the evocative moniker "il Rosso"—a tribute to his distinctive auberm hair—this Florentine sculptor navigated the shifting tides of artistic innovation with remarkable grace. While his precise birthdate…