Jan van Valckenborgh

Johan van Valckenburgh (c. 1575 − 1624) was a Dutch military engineer who built fortresses.

He was working for Maurice of Orange in 1606 under the tutelage of Johan van Rijswijck.

[1] His work in Hamburg introduced a second layer to the fortifications to protect against the Thirty Years War.

He created a "New Town" (Neustadt) whose street names still dates from the grid system of roads he introduced.

[2] van Volckenburg died in 1625 as a Dutch soldier fighting the Spanish during the Eighty Years War in 1625.