"Mining the rich documentary sources housed in Tuscan archives and taking advantage of the breadth and depth of scholarship produced in recent years, the seventeen essays in this Companion to Cosimo I de' Medici provide a fresh and systematic overview of the life and career of the first Grand Duke of Tuscany, with special emphasis on Cosimo I's education and intellectual interests, cultural policies, political vision, institutional reforms, diplomatic relations, religious beliefs, military entrepreneurship, and dynastic concerns. Contributors: Maurizio Arfaioli, Alessio Assonitis, Nicholas Scott Baker, Sheila Barker, Stefano Calonaci, Brendan Dooley, Daniele Edigati, Sheila ffolliott, Catherine Fletcher, Andrea Gáldy, Fernando Loffredo, Piergabriele Mancuso, Jessica Maratsos, Carmen Menchini, Oscar Schiavone, Marcello Simonetta, and Henk Th. van Veen"--