"Jan Ziarnko, also known as Jean Le Grain, Kern and Grano, was a Polish draughtsman and printmaker. He was born in Lviv circa 1575 into a family with German ancestry and he died sometime around 1630, possibly in the same town. He is one of Poland’s most respected graphic artists of the period.
Not much is known about his early life and artistic formation; although in 1596–7 he appears as a member of the Brotherhood of Catholic Painters in Lviv. After training in his native country, he travelled through Italy and Germany to France in about 1598. Ada Palka has suggested that Ziarnko may have come into contact with artists involved in painting anamorphic scenes at this time." - (en.wikipedia.org 12.08.2021)
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