Johann Franz Graf von Gronsfeld-Bronckhorst (1640-8 April 1719) was a German military officer, President of the Imperial War Council and Field Marshal during the Bavarian uprising of 1705–1706.
As early as 1665 or earlier, on a journey from Mainz to Frankfurt, Gronsfeld allegedly suggested the polyalphabetic encryption method named after him to the writer and Jesuit priest Gaspar Schott.
[2] On 15 May 1705, Gronsfeld approached the city of Munich with 8,000 men and siege guns and demanded its immediate surrender under threat of bombardment.
Divergences between the imperial administration in Bavaria and the military command led to Gronsfeld being dismissed, following a letter of complaint to Emperor Joseph I on 6 June 1705.
The Törring family lost the county with the German mediatisation of 1803 and received the imperial Gutenzell Abbey in return.