Pfennig - Berthold II von Pfirt

Berthold II von Pfirt served as Bishop of Basel during a period of intense friction between the episcopal administration and the burghers of the city, tensions that would eventually culminate in Basel's gradual assertion of communal independence over the following century. His episcopate coincided with the broader collapse of Hohenstaufen imperial authority after Frederick II's death in 1250, which left Rhenish ecclesiastical lords operating with unusual autonomy but also unusual vulnerability.

The Wielandt and Wüthrich references place this squarely within the Breisach-associated bracteate tradition of the Upper Rhine, where silver of this fineness circulated in extraordinarily thin, single-sided form across markets stretching from Basel to Freiburg.