(3) Signatures - The first being Sylvester Douglas, 1st Baron Glenbervie (Lord Glenbervie, 1743-1823) Chief Secretary for Ireland between 1793 and 1794. --- The second being Prince William Frederick the Duke of Glouchester and Edinburgh (1776 - 1834). --- The third being George Hamilton-Gordon the 4th Earl of Aberdeen (1784-1860), who after 1812 became a diplomat, and in 1813, at age 29, was given the critically important embassy to Vienna, where he organized and financed the sixth and final coalition that defeated Napoleon. From the Francis Hopkinson Family Archives