18 September 1809 September 17, 2022 Author: Staff The Royal Opera House in London opens. Famous Words of Inspiration..."It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt." Mark Twain — Click here for more from Mark Twain Related posts: 18 September 1809 18 September 1809 18 September 1809 7 December 1732 26 September 1905 9 October 1986 28 December 1065 30 June 1905 20 March 1916 30 June 1905 Categories: History Tags: 18 September, 1809