The Council of Constance was much more than just a church assembly. Since many high-ranking secular representatives came to the great medieval congress, other far-reaching decisions were also made in Constance. Simultaneously to the Council, two Imperial Diets took place in 1415 and 1417.

Here, at the "Obermarkt", the medieval court place, King Sigismund gave Burgrave Friedrich von Zollern the fiefdom of Mark Brandenburg in 1417. The scene is colourfully depicted on the "Haus zum Hohen Hafen", yet it is only one example of the many secular activities during the Council.

The Constance city arms keep reappearing in the fresco. As a reward for the successful organisation of the Council, King Sigismund added a red bar to the city arms. The so-called "blood bar" symbolizes the right to impose capital punishment even in Petershausen. Furthermore, the city was assigned the right to use red sealing wax. Sigismund also gave Constance the privilege of maintaining its own trumpet players. Today's musical societies of Constance still refer to this ancient right.