Johann Helmann was Assay Master from 1481 to 1506 and Mint Warden in Cologne in 1481. He was appointed on 5 April 1481 as
Assayer in Rhiel, a city in Germany, for Trier, Jülich, Cologne and the Archbishopric of Cologne. Lit.: Alfred Noss, Die Münzen
der Städte Köln und Neuss: 1474-1794 (1926) pp. 17, 21, 22, 28, 47-49; Wolfgang Scheffler, Goldschmiede Rheinland-Westfalens
- Aachen - Köln (1973) n. 494, p. 419.
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