In the middle of the tenth century the northern and eastern boundaries of Germany were as yet very ill defined. The Slavic peoples across the Elbe, many of whom were still pagans, were engaged in continual attacks upon the borders of Saxony. Otto I did more than fight these tribes; he established dioceses, such as Brandenburg, Havelberg, etc., in a district which is now the political center of the German empire, and greatly forwarded the Christianizing and colonization of the tract between the Elbe and the Oder. [Sidenote: Final defeat of the Hungarians.] [Sidenote: Beginnings of Hungary and Austria.] Moreover, he put an end forever to the invasions of the Hungarians. He defeated them in a great battle near Augsburg (955) and pursued them to the confines of Germany. The Hungarians, or Magyars as they are commonly called, then settled down in their own territory and began to lay the foundations of that national development which makes them one of the most important factors in the eastern portion of Europe to-day. A region which had belonged to the Bavarian duchy was organized as a separate district, the Austrian _Mark_ (i.e., March), and became the nucleus of the Austrian empire. [Sidenote: Otto interferes in Italian affairs.] 57. The most noteworthy, however, of Otto's acts was his interference in Italian affairs, which led to his assuming the imperial crown which Charlemagne had worn. There is no more gloomy chapter in European history than the experiences of Italy and the papacy after the deposition of Charles the Fat in 887. We know little of what went on, but we hear of the duke of Spoleto, the marquis of Friuli, and Burgundian princes from across the Alps, assuming the Italian crown at different times. The Mohammedan invasions added to the confusion, so that Germany and France, in spite of their incessant wars, appear almost tranquil compared with the anarchy in Italy.[100] Three Italian kings were crowned emperor by the popes during the generation following the deposition of Charles the Fat. Then for a generation the title of emperor disappeared altogether in the West, until it was again assumed by the German Otto. [Sidenote: Otto is crowned emperor, 962.] Italy was a tempting field of operations for an ambitious ruler. Otto first crossed the Alps in 951, married the widow of one of the ephemeral Italian kings, and, without being formally crowned, was generally acknowledged as king of Italy. The revolt of his son compelled him to return to Germany, but a decade later the pope called him to his assistance. Otto answered the summons promptly, freed the pope from his enemies, and was crowned emperor at Rome in 962. [Sidenote: Important results for Germany of the coronation of Otto the Great.]