An account of the naval commander Roger of Lauria and his command of warfare at sea. Just before Vespers on 30 March 1282 at the Church of the Holy Spirit on the outskirts of Palermo, a drunken soldier of the occupying French forces of Charles of Anjou accosted a young Sicilian noblewoman. It sparked a bloody conflagration, the so-called War of the Sicilian Vespers, that would ultimately involve every part of the Mediterranean. The struggle...