Cathedral chapter
Hermman von Münster is actually the first stained glass artist to be mentioned by the archives of the Cathedral chapter of Saint-Etienne of Metz. On August 29, 1381, master Hermann received an annuity of 22 pounds, to pay for its work on the western large window of the cathedral of Metz. His work was supported by Cardinal William Aigrefeuille, legate of the antipope Clement VII, who then reorganized the Chapter of Metz. Three years later, on 2 May 1384, the Cathedral chapter negotiated the price of the "GRANT OZ", the western Rose window with Hermann von Munster. Hermann was still working on the windows of the western facade in December 1384. In August 1385, the Cathedral Chapter borrowed 420 pounds to set the work completed.