 Complete the following phrase:  Alfonsos education was at his fathers humanist court. His tutor between 1468 and 1475 was the humanist Giovanni Pontano, whose De principe describes the proper virtues and manner of life becoming to a prince; the work took the form of letter of advice to the twenty-year old Alfonso, then Duke of Calabria, in 1468. Pontano dedicated a further treatise on courage, De fortitudine, to Alfonso in 1481, after his victory over the 