John Conduitt (1688-1737) was a member of parliament for Southampton and Master of the Mint, having succeeded Sir Isaac Newton, his uncle by marriage. He is said to have commented on Newton’s gravitational theory as follows: "In the year 1666 ... while he was musing in a garden it came into his thought that the power of gravity (which brought an apple from a tree to the ground) was not limited to a certain distance from earth, but that this power must extend much further than was usually thought. Why not as high as the Moon thought he to himself & that if so, that must influence her motion & perhaps retain her in her orbit, whereupon he fell a-calculating what would be the effect of that superposition..." ( Keesing, R.G., The History of Newton's apple tree, Contemporary Physics, 39, 377-91, 1998).
This medal, which was struck on his death, was designed by Gravelot, who describes it as "Mr. Conduit, under the guidance of Astraea, joins Newton and Hamden in the Elysian fields." (M.I.)

LINK to Newton's Theory of Universal Gravitation