He completed the Prima Pars (first part) in its entirety and circulated it in Italy before departing to take up his second regency as professor at the University of Paris (1269–1272).
Ia menyelesaikan Prima Pars (Bagian Pertama) secara keseluruhan kemudian mendistribusikannya di Italia sebelum berangkat untuk menempuh masa jabatan keduanya sebagai profesor di Universitas Paris (1269–1272).