The two later encounter a duke and duchess who pretend to make Sancho governor of a fictional fief, "la ínsula Barataria" (roughly "Isle Come-cheaply"; see Cockaigne). He eagerly accepts and leaves his master. In a letter, Don Quixote gives Sancho provincial advice on governorship gleaned from the romances he has read, thought to have been inspired by the "Diálogo de Mercurio y Carón" attributed to Alfonso de Valdés. Quixote's simplistic and romantic understanding of government may have been the author using the allegorical ínsula to satirize the lack of practical learning on the part of philosopher-doctors placed in positions of power.