King has been called the first great economic statistician, surpassing Petty. King was an engraver, herald, surveyor, and Secretary to the Commissioners for the Public Accounts, but he is best known for his 1696 estimates of the wealth and population of England. Writing in 1696, but calculating for the year 1688, he put the population at approximately 5.5 million, and his work was not published at the time because it was considered strategic information. It was rediscovered and first published, with a life of King by antiquarian and political writer George Chalmers as an appendix to the 1802 edition of Chalmers's work.  It first appeared as a separate treatise issued by Stockdale in 1804. Reprinted in Two Tracts by Gregory King.(a) Natural and Political Observations and Conclusions upon the State and Condition of England. (b) Of the Naval Trade of England Ao. 1688 and the National Profit then arising thereby. Edited with an introduction by George E. Barnett. (Baltimore: Johns Hopkins Press, 1936.) Digital facsimile of the 1802 edition from the Internet Archive at this link.