"Christopher Elias Heiss (1660–1731) was a German painter from Memmingen, Swabia.
Born in 1660 (although many books sources claim 1670 or even 1760), he painted portraits well, ...
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he was mostly distinguished by his mezzotintos, which he executed on an uncommonly large scale, some of his plates being three feet high and two feet wide." - (en.wikipedia.org 03.09.2022)