Jacob Willemsz Delff I was a Dutch Golden Age painter and engraver born in the year 1550 in Gouda, Netherlands. He was known for his portraits and historical allegories. Delff's early life is not well-documented; however, it is believed that he was a pupil of the engraver Dirck Volkertsz Coornhert, who was based in Gouda at that time. Delff later moved to Delft, where he became a prominent member of the local guild of St. Luke, a common association for painters, and where he derived his surname.
Jacob Willemsz Delff I's work was influenced by the mannerist style, which was characterized by artificiality, grace, and elegance of design. He developed a reputation for his fine portrait paintings, which often conveyed the social status and character of his sitters through elaborate clothing and detailed facial expressions. Delff's engravings were also well-regarded, and his skill in this medium contributed to his fame.
Delff married twice, and his children from these marriages continued his artistic legacy. His sons, Jacob Willemsz Delff II and Willem Jacobsz Delff, became painters, while another son, Cornelis Jacobsz Delff, was a still-life painter. Jacob Willemsz Delff I's death occurred in 1601 in Delft. His work has been preserved in various Dutch museums and continues to be studied for its contribution to the portrait genre during the Dutch Renaissance.