Most beer authorities trace the origins of Berliner Weisse to an unknown beer being produced in Hamburg which was copied and developed by the 16th century brewer Cord Broihan. Broihan's beer, "Halberstädter Broihan", became very popular, and a version was being brewed in Berlin by the Berlin doctor J.S. Elsholz in the 1640s. An alternative possibility, given by Protz among others, is that migrating Huguenots developed the beer from the local red and brown ales as they moved through Flanders into Northern Germany. Some sources, such as Dornbusch, give the date 1572 as being the earliest record of the beer being brewed in Berlin.