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Recently, there has been an upsurge of interest in the work Periphyseon of the early medieval philosopher John Scot Eriugena. Previous research has classified the book either as a piece of Neoplatonic philosophy or as part of the Latin dialectic tradition, which has led to one-sided interpretations. The present publication focuses instead on the philosophical claims defended in the Periphyseon itself, examines its originality and discusses the soundness of its argumentation. As a result, a hitherto unnoticed basic thought of the work has been uncovered, namely the concept of a negative ontolog.