Towards the end of the fourth and the beginning of the fifth centuries of the Christian era a celebrated woman Hypatia, born in the year 370, taught the doctrines of Neoplatonism in theschool of Alexandria. She died in 415, massacred by the fanatic followers of St. Cyrille. To Hypatia the invention of areometers has been attributed. As her writings were destroyed with the burning of the library of Alexpdria, this assumption is based iipon a letter which she wrote to one of her pupils, Synesius,

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... a Greek writer, who afterwards became bishop of Ptolemais, in 410, and died in 431.