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In page History of literature:

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Around 400 AD, the Prudenti Psychomachia began the tradition of allegorical tales. Poetry flourished, however, in the hands of the troubadours, whose courtly romances and chanson de geste amused and entertained the upper classes who were their patrons. The First Crusade in 1095 also affected literature. For instance the image of the knight would take on a different significance. The Islamic emphasis on scientific investigation and the preservation of the Greek philosophical writings would also affect European literature.[citation needed]