Task: Text Categorization
Input (English): One of his campaigns was conducted against Grimoald III, duke of Benevento, who had formerly been his hostage. In his namesake Libri, theologians attacked the Second Council of Nicaea, before he himself convened the Synod of Frankfurt, which overruled that ecumenical council. In his "cold war" with the Byzantines, he advanced his own candidate to succeed Hadrian I, Pope Leo III. Defeat at Zaragoza forced his troops to retreat to Roncevaux Pass in the Pyrenees, a site famous for the poem it inspired, The Song of Roland. His biographer Einhard served as secretary for his son and successor, Louis the Pious. FTP, name this king of the Franks, whom Leo crowned Holy Roman Emperor on December 25, 800.
Output (English): History