 The School of Alexandria was closed by the Muslim conquest in 641, but between the eighth and the early tenth century, much of the treasury of Greek scientific and philosophical texts it left was put into Arabic, often by Syriac speaking Christians and sometimes through the intermediary of Syriac. Almost the whole of Aristotle was translated, along with commentaries from the Platonic schools and works by the Aristotelian,  Alexander of Aphrodisias  (working c. AD 200) (Gutas 1998). Reworked versions of texts by  Plotinus  and the fifth-century Platonist  Proclus  were also made in Arabic, but Plato himself was hardly known except through translations of epitomes. (See also  Greek sources in Arabic and Islamic philosophy.)