Cosimo di Giovanni de’ Medici was of most honourable descent, a very prominent citizen and one of great weight in the republic. He was well versed in Latin letters, both sacred and secular, of capable judgment in all matters and able to argue thereupon. His teacher was Roberto dei Rossi, a good Greek and Latin scholar and of excellent carriage. At this time many other youths of good station were his fellow-pupils: Domenico di Lionardo Buoninsegni, Bartolo Tebaldi, Luca di Messer Maso degli Albizzi, Messer Alessandro degli Alessandri and many others who came together regularly for instruction. Roberto lived in his own house, unmarried, and when he went out he was usually accompanied by the above-named, who were held in much esteem both for their good conduct and learning: moreover, Roberto would often entertain his pupils at table. He made a most excellent will which divided his large library of books written by his own hand—and he was one of the finest of scribes—amongst his pupils.