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Otto of Freising, Chronica sive Historia de duabus civitatibus, Book VI, ed. Ado...
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Otto of Freising, Chronica sive Historia de duabus civitatibus, Book VI, ed. Adolf Hofmeister, Monumenta Germaniae Historica, Scriptores rerum Germanicarum in usum scholarum separatim editi, vol. 45 (Hannover: Hahn, 1912), p. 292