1911 Encyclopædia Britannica, Volume 11… (1911)
“ FRANKFORT-ON-MAIN (Ger. Frankfurt am Main) , a city of Germany, in the Prussian province of Hesse-Nassau, principally on the right bank of the Main, 24 m. above its confluence with the Rhine at Mainz, and 16 m. N. from Darmstadt. Always a place of great trading importance, long the place of election for the German kings, and until 1866, together with Hamburg, Bremen and Lübeck, one of the four free cities of Germany, it still retains its position as one of the leading commercial centres of the German empire. ”
