De Haar Castle (Dutch: Kasteel de Haar) is located in Utrecht, Netherlands. It is the largest castle in The Netherlands. Original site The oldest historical record of a building at the location of the current castle dates to 1391. In that year, the De Haar family received the castle and the surrounding lands as a fiefdom from Hendrik van Woerden. The castle remained in the ownership of the De Haar family until 1440, when the last male heir died childless. The castle then passed to the Van Zuylen…