Assertion: homer's poem | /r/HasProperty | composed in the mid-10th century bce
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text: In 1795, he published his Prolegomena ad Homerum, in which he argued that the poems were composed in the mid-10th century BCE; that they were transmitted orally; that they changed considerably after that time in the hands of bards performing them orally and editors adapting written versions to contemporary tastes; and that the poems' apparent artistic unity came about after their transcription.