I have not seen Frederiksborg, but you are probably right. At

http://wictor.dk/wictor/frederiksborg/frbSlotGB.html are pictures + info about Frederiksborg and at http://www.kronborgcastle.com/ about Kronborg. Both pages are in English.

Hamlet's castle was in Elsinore, hence the tale because Kronborg is Elsinore's only castle. Anyway Hamlet is just a play. Some claim that Othello came from Cyprus. True or false? I do not know, but when in Cyprus last year I tasted a Cypriot red wine named Othello, and I have always had a better taste for wines than theater, which of course is bad taste :-)

Regards, Eric Bentzen, Denmark