"Jacob Folkema (18 August 1692 – 3 February 1767), a Dutch designer and engraver, was born and died at Dokkum, in Friesland. He was first instructed by his father, Johann Jakob Folkema, a goldsmith, and studied afterwards under B. Picart at Amsterdam. During that time he worked for Royaumont's Bible, 1712, and Ruysch's Anatomy, 1737. Folkema was also an excellent engraver in mezzotint. He had a sister, Anna Folkema, who painted miniatures, assisted her brother, and engraved some few plates. She was born in 1695, and died in 1768." - (Wikipedia (en) 10.08.2021)
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