951 Southern Europe: John Curcuas dies in Messina; he is succeeded as Western Byzantine emperor by his nephew Theophilus. Otto I of Saxony stages an expedition to Lombardy, retaking Trento on the way, but Berengar’s forces bottle him up in the Adige valley between Trento and Verona and force him to withdraw. Count Sigifred of Lucca and his young son, Adalbert Atto, powerful vassals of margrave Guido of Tuscany from an ancient Lombard family, complete the building of the fortress of Canossa in the Apennines near Reggio Emilia: their descendants will take their name from the castle. Arabia: