The document summarizes a story from The Decameron about Saladin, a prince of Babylon, who travels in disguise to Pavia to scout an insurgency. There, he meets and stays with Messer Torello, who treats him and his men with great kindness and hospitality. Later, Messer Torello is captured during a crusade. He is recognized by Saladin and becomes his falconer. When Messer Torello falls ill after believing his wife has remarried, Saladin uses magic to return him home in time to stop the wedding, repaying Messer Torello's earlier kindness. The story illustrates the golden rule of treating others as you wish to be treated