The most important exponent of this new development was Jacob van Maerlant (~1235–~1300), a Flemish scholar who worked in Holland for part of his career. His key works are "Der Naturen Bloeme" ("The Flower of Nature", c. 1263), a collection of moral and satirical addresses to all classes of society, and "De Spieghel Historiael" ("The Mirror of History", c. 1284). Van Maerlant straddles the cultural divide between the northern and southern provinces. Up until now, the northern provinces had produced little of worth, and this would largely remain the case until the fall of Antwerp during the Eighty Years' War shifted focus to Amsterdam. He is sometimes referred to as the "father of Dutch poetry", "a title he merits for productivity if for no other reason."