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In page Emperor Kanmu:

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Politically Kammu shored up his rule by changing the syllabus of the university. Confucian ideology still provided the raison d'être for the Imperial government. In 784 Kammu authorised the teaching of a new course based on the Spring and Autumn Annals based on two newly imported commentaries: Kung-yang and Ku-liang. These commentaries used political rhetoric to promote a state in which the Emperor, as "Son of Heaven", should extend his sphere of influence to barbarous lands, thereby gladdening the people. In 798 the two commentaries became required reading at the government university.[citation needed]