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Otto, a cultivated man, continued his father’s policies of promoting a strong monarchy in Germany and of extending the influence of his house in Italy. In 961 he was crowned co-regent king of Italy and Germany with his father and was made co-regent emperor in 967. On April 14, 972, he married the Byzantine princess Theophano. At his father’s death in 973 he was accepted without opposition as successor, although revolts in the duchy of Bavaria and in Lorraine occupied the early years of his reign. Bavaria, the most independent of the duchies, rebelled in 974, under the leadership of its duke, Henry II the Quarrelsome, Otto’s cousin. It was not until 978 that Bavaria was pacified, the same year that Lothar, king of France, invaded Lorraine. In 979 Otto received the submission of Bohemia and Poland, and in 980 Lothar renounced his claim to Lorraine. Having thus secured his German dominions, Otto marched into Italy in 980, where German rule had been maintained by an imperial party headed by Hugh, marquis of Tuscany. Otto invaded southern Italy and was decisively defeated there by a Muslim army in 982. In 983 he summoned a diet at Verona, where his young son, Otto III, was crowned German king. Otto II died in 983 in Rome, of malaria. His absence from Germany had occasioned revolts along its borders, and after his defeat in Calabria in 982 the German position east of the Elbe collapsed because of a revolt by the Danes and an invasion by the Slavs. Nonetheless, Otto maintained the essential successes of his father and left a firmly established realm to his son and successor Otto III.
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