John Philoponus stands out for having attempted a fundamental critique of Aristotle's views on the eternity of the world, movement, and other elements of Aristotelian thought.
dʒˈɑːn fˈɪləpˌoʊnəs stˈændz ˈaʊt fɔːɹ hˌævɪŋ ɐtˈɛmptᵻd ɐ fˌʌndəmˈɛntəl kɹɪtˈiːk ʌv ˈæɹɪstˌɑːɾəlz vjˈuːz ɔnðɪ ɪtˈɜːnᵻɾi ʌvðə wˈɜːld, mˈuːvmənt, ænd ˈʌðɚɹ ˈɛlɪmənts ʌv ˌæɹɪstoʊtˈiːliən θˈɔːt.