Gideon died of dropsy at Belvedere House, near Erith, Kent, in October 1762, aged 63, having a gained a fortune recorded as £350,000 (equivalent to $ million in ). He left £1000 to the Sephardi Jewish congregation in London on condition he was buried with honour as a married man in their cemetery in Mile End. (He did not marry a Jew, which under Jewish law precludes recognition as a married man). In 2005, the Bexley Civic Society restored a memorial to Sampson Gideon, located in the grounds of All Saints Church, Belvedere, and produced a plaque bearing a brief history of his life. The plaque reads, "This memorial commemorates the life of Sampson Gideon (1699–1762) sometime owner of Belvedere House, and father of Lord Eardley. A financier of nationwide renown, he is believed to have been a founder of the London Stock Exchange. Such was his reputation that the British government resorted both to his wealth and advice to underwrite the national debt, and finance the army during the Jacobite Rebellion of 1745 and the Seven Years' War of 1756–63. Amongst his descendants can be numbered Hugh Childers, Gladstone's Chancellor in his 1880–1885 ministry and Erskine Childers, Irish patriot and author of 'The Riddle of the Sands'. Another descendant Sir Culling Eardley was responsible for the building of this church".