The Swabian League of Cities is formed…
1324 CE to 1335 CE
The Swabian League of Cities is formed on November 20, 1331, when twenty-two Imperial Cities of the former Duchy of Swabia band together in support of the Emperor Louis IV, who in return promises not to mortgage any of them to any imperial vassal.
Among the founding cities are Augsburg, Heilbronn, Reutlingen and Ulm.