 During Charles's childhood and teen years, William de Croÿ (later prime minister) and Adrian of Utrecht (later Pope Adrian VI) served as his tutors.The culture and courtly life of the Low Countries played an important part in the development of Charles's beliefs.As a member of the Burgundian Order of the Golden Fleece in his infancy, and later its grandmaster, Charles was educated to the ideals of the medieval knights and the desire for Christian unity to fight the infidel.