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Barlaamism is a theological doctrine proposed by fourteenth-century Calabrian monk Barlaam of Seminara. Barlaam challenged the possibility of having experiential knowledge of God, instead asserting that knowledge of God can only be propositional, contrary to the beliefs of the Hesychast
As a product of both East and West, Barlaam influenced the culture of both. Petrarch and Boccaccio were his pupils, and there is no doubt that he contributed to the strengthening of the current that led to the Italian Renaissance. On the other hand, Barlaam's interest in the hesychast dispute resulted in the development of a lively theological movement in the fourteenth century in Constantinople and Thessalonica. One of its consequences was the formulation of the mystical-ascetical teaching of the Orthodox church by Gregory Palamas.