Jan van Valckenborgh

Johan (Jan ) van Valckenburgh (* 1575, † 1625 in Voorburg, Leidschendam- Voorburg today ) was a Dutch engineer who was best known for the fortress.

In 1606 he became an engineer in the employ of the Dutch Prince Maurice of Orange in front of him as the fortress builder Johan van Rijswijck. His first major work as a self-responsible engineer, he returned from the Hanseatic city of Lüneburg. He designed 10 major fortifications, including the Hamburg ramparts (from 1616), the Bremer ramparts, the Lübeck Bastionärbefestigung ( 1613 ), the Rostock city's fortifications in 1624 and the Emden Wall. The Hanseatic cities coordinated while their fortress at least temporarily, by the by them jointly commissioned military commander Colonel Friedrich Graf zu Solms- Roedelheim. Johan van Valckenburghs activity was not confined to northern Germany, he was responsible among other things for the conversion and extension of the medieval Ulmer city fortifications to early modern Bastionärsbefestigung ( 1617-1619 ).

The Eighty Years' War between Spain and its breakaway province, the Netherlands was rekindled after years of ceasefire. Johan van Valckenburgh fell in 1625 in Voorburg, near The Hague in the fight against the Spaniards. In Hamburg planet un Blomen in Hamburg Wallanlagen a Johan van Valckenburgh Bridge reminded of him. According to van Valckenburgh the Johan van Valckenburgh bridge in Hamburg and the Valckenburgschule was named in Ulm ( name version without h).