Moscow was first mentioned in 1147 when "''the prince of Rostov and Suzdal Yuri Dolgorukiy (Long Arms) invited his ally Svyatoslav the prince of Novgorod Severskiy to visit him in Moscow''."<ref>[http://faculty.oxy.edu/richmond/csp8/history_of_moscow.htm The History of Moscow], Walter Comins-Richmond</ref> The first Saturday of September is celebrated as the Founding Day. | Moscow was first mentioned in 1147 when "''the prince of Rostov and Suzdal Yuri Dolgorukiy (Long Arms) invited his ally Svyatoslav the prince of Novgorod Severskiy to visit him in Moscow''."<ref>[http://faculty.oxy.edu/richmond/csp8/history_of_moscow.htm The History of Moscow], Walter Comins-Richmond</ref> The first Saturday of September is celebrated as the Founding Day. |