Green Dragon Tavern was a public house used as a tavern and meeting place located on Union Street in Boston's North End. The property had been inherited by Mehitable (Minot) Cooper from her uncle, William Stoughton, in 1701. The Green Dragon Tavern was purchased from her son, William Cooper, by William Douglas, physician and pamphleteer, in 1743. Douglas lived in the tavern, calling it his "mansion house". After his death in 1752, the tavern passed to his sister, who sold it to the St. Andrews Lodge of Freemasons in 1766.