| Master Gerhard|| Cologne Cathedral|
| April 25, 1271, Cologne, Germany|
Ernst Friedrich Zwirner, Richard Voigtel, Barbara Schock‑Werner, Clemens Ganz, Winfried Bonig
Master Gerhard Wikipedia
Meister or Master Gerhard (* c 1210/1215 allegedly in Reil – 24 or 25 April 1271 in Cologne) was the first master mason of Cologne Cathedral. He was also known as Gerhard von Rile or by the Latin version of his name, Meister Gerardus.