Great , Storm has got it . And I agree that he was not one of greatest person in terms of fame (or) the magnitude of his achievement . But after the manuscripts of Micheal Servetus alias Miguel Serveto , a physician of the 15th century , with a multitude of other interests , on pulmonary circulation were destroyed , William Harvey was the one who succeeded in rediscoverering them and putting mankind on the right path.
And moreover , the allusion to his greatness was my personal viewpoint . It was not included in the riddle .
And Congrats to Itachi-san for unraveling the hidden meaning of the puzzle initially .
And LIS , hats-off to your reasoning . And by the way I am against the concept of time travel , I support the theory of Multiverse.