The works of Aristotle were translated from Greek to Arabic by Islamic scholars in the early Middle Ages, mostly pre-dating the Latin translations, and they were sometimes the source from which the Latin translations were made.
Greek Orthodox; Roman Catholics forgot Greek. Until Marsilio Ficino translated Plato to Latin around 1450, Plato had been effectively lost in the west for 1000 years.
1. https://en.wikipedia.org/wiki/Recovery_of_Aristotle
2. https://plato.stanford.edu/entries/arabic-islamic-influence/