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In page Galen:

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Galen may have produced more work than any author in antiquity, rivaling the quantity of work issued from Augustine of Hippo.[1] So profuse was Galen's output that the surviving texts represent nearly half of all the extant literature from ancient Greece.[2][1] It has been reported that Galen employed twenty scribes to write down his words.[3] Galen may have written as many as 500 treatises,[4] amounting to some 10 million words.[citation needed] Although his surviving works amount to some 3 million words,[5] this is thought to represent less than a third of his complete writings. In 191, or more likely in 192, a fire in the Temple of Peace destroyed many of his works, in particular treatises on philosophy.[6]