Context : Lange Voorhout Palace (Dutch: Paleis Lange Voorhout (paːˈlɛis ˈlɑŋə voːrˈɦʌut)) in The Hague was designed in 1760 by the architect Pieter de Swart for Anthony Patras (1718-1764), a deputee to the States General of the Netherlands. 
Answer : Pieter de Swart
Who was the designer of Lange Voorhout Palace?