Juan Manuel's work is marked by a great preoccupation both with the practical and the spiritual life, and is directed not only to the nobility, but also to lower estates, since much of his work speaks not only of the duties of lords, but of their vassals as well. While his work is often classified under the general Medieval rubric of "the education of princes" it also begins to approach the Machiavellianism which is more characteristic of the Renaissance, by virtue of its dedication to the astute art of governing.