Leonello had little influence over the Italian political landscape and aristocracy in Ferrara. Contrary to other prior d’Este family leaders, such as Azzo VII, Niccolò III, and Isabella d’Este, who had a drive for power and control, Leonello is recognized principally for his sponsorship of the arts, literature, and culture. In 1441–1450, his learned courts and developing knowledge assisted him in transforming the city of Ferrara. Under the guidance of Guarino Veronese, his humanist teacher, and with the approval of the commune, Leonello began the reformation, particularly, the University of Ferrara.