The painter Giovanni Antonio de’ Sacchis (1484–1539) is always known as Il Pordenone, after his birthplace in Friuli, in northeast Italy.
Due to the enormous demand De Swart asked his former companion Hans le Maire (1586-1641), who had moved in 1617 to Amsterdam, to share in his patent.
He was an etcher, poet, director of the mint at Dordrecht, and art theorist.
His In (Introduction to the Art of Painting, 1678) is an invaluable source for understanding Dutch seventeenth-century art theory and also contains one of the rare contemporary appraisals of Rembrandt's work.
Hans le Maire, Amsterdam gilt leather-maker (1576-1640), gilt leather panel, c.1635-40, detail with Auricular mascaron.
On 4 August 1628 Jacob Dircxz de Swart (before 1594-1641), gilt leather-maker in The Hague, was granted a patent by the States General of the Dutch Republic for fourteen years on a new production method by which it was possible to mass-produce gilt leather with relief patterns.