Eupolemus
Jewish historian of the 2nd century BC. Cited by Eusebius as reporting that Moses transmitted letters to the Egyptians and was called Mercury.
Preface and Praise of Sacred Scripture
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Moses as the Most Ancient Theologian, Philosopher, Poet, and Historian
— Cited by Eusebius: says Moses transmitted letters to the Egyptians and was called Mercury
"To these add Eupolemus and Artapanus"