Jennis was born to Lucas Jennis the Elder in Frankfurt. His father was a wealthy goldsmith, jeweller, and engraver who had fled persecution in Brussels. Jennis’ father died in 1606. A year later,
Johann Israel de Bry (1565–1609) married Jennis’ widowed mother. Jennis was now a member of the
de Bry family, who were famous for their engraving work.
Johann Theodor de Bry (1561–1623) was his step uncle. ==Works==