▁of ▁the ▁absolute ▁mon archy ▁which , ▁instit uted ▁by ▁Frederick ▁III , ▁played ▁an ▁important ▁part ▁in ▁supporting ▁architect ural ▁develop ments . ▁ ▁St air way ▁at ▁G j ors lev ▁ ▁In ▁ 1 6 6 5 , ▁J ans sen ▁completed ▁his ▁first ▁major ▁achiev ement ▁with ▁a ▁connecting ▁st air way ▁at ▁the ▁medieval ▁G j ors lev ▁Castle ▁in ▁the ▁south ▁of ▁Se aland . ▁It ▁appears ▁to ▁have ▁been ▁copied ▁from ▁an ▁earlier ▁design ▁by ▁Dutch ▁architect ▁Phili ps ▁V ing bo ons . ▁ ▁Sk ander borg ▁Castle ▁After ▁his ▁appointment ▁as ▁royal ▁master builder ▁in ▁ 1 6 6 8 , ▁he ▁prepared ▁a ▁number ▁of ▁draw ings ▁showing ▁how ▁Sk ander borg ▁Castle ▁could , ▁for ▁a ▁reason ably ▁small ▁sum , ▁be ▁adapted ▁to ▁the ▁style ▁of ▁the ▁period , ▁possibly ▁for ▁the ▁use ▁of ▁Crown ▁Princess ▁Charlotte ▁Am al ie . ▁The ▁work ▁was , ▁however , ▁not ▁carried ▁out . ▁ ▁Charlot ten borg ▁ ▁His ▁original ▁draw ings ▁for ▁Charlot ten borg ▁Palace ▁appear ▁once ▁again ▁to ▁have ▁been ▁based ▁on ▁V ing bo om ' s ▁plans ▁for ▁Amsterdam ' s ▁city ▁hall ▁which ▁is ▁now ▁the ▁royal ▁residence . ▁It ▁was ▁only ▁thanks ▁to ▁Lam bert ▁van ▁H aven ' s ▁significant ▁alter ations ▁that ▁the ▁building ▁has ▁a ▁style ▁of ▁its ▁own . ▁Nevertheless , ▁it ▁is ▁considered ▁to ▁be ▁one ▁of ▁Den mark ' s ▁architect ural ▁master pie ces . ▁ ▁N ys ø