Sir William Hamilton, KB, PC, FRS, FRSE was a British diplomat, politician, antiquarian and vulcanologist who served as the Envoy Extraordinary to the Kingdom of Naples from 1764 to 1800. After sitting in the House of Commons of Great Britain from 1761 to 1764, he began working as a diplomat, succeeding Sir James Gray as the British ambassador to the Kingdom of Naples. While in Italy, Hamilton became involved in studying local volcanoes and collecting antiquities, becoming a fellow of the Royal Society and being given the Copley Medal. His second wife was Emma Hamilton, who was famed as the mistress of Horatio Nelson, 1st Viscount Nelson.

The Copley Medal is the most prestigious award of the Royal Society, conferred "for sustained, outstanding achievements in any field of science". It alternates between the physical sciences or mathematics and the biological sciences. Given annually, the medal is the oldest Royal Society medal awarded and the oldest surviving scientific award in the world, having first been given in 1731 to Stephen Gray, for "his new Electrical Experiments: – as an encouragement to him for the readiness he has always shown in obliging the Society with his discoveries and improvements in this part of Natural Knowledge". The medal is made of silver-gilt and awarded with a £25,000 prize.