1 Groschen - John II of Nassau

John II of Nassau held the archiepiscopal see of Mainz from 1397 until his death in 1419, a tenure marked by his efforts to reassert electoral authority during the fractious years following the Western Schism. Mainz, as one of the three ecclesiastical prince-electors, maintained its own mint operations partly as an expression of that political standing — groschen issues like this one circulated widely across the Rhine-Main region and served practical trade functions at Rhenish fairs and markets.

The Walther and Priesack-Alexander references place this firmly within the documented Nassau archiepiscopal series, a relatively well-catalogued group compared to many contemporary German ecclesiastical issues.