5 3 7 , ▁Den mark ▁and ▁Norway ▁formed ▁a ▁personal ▁union ▁that ▁would ▁eventually ▁develop ▁into ▁the ▁ 1 6 6 0 ▁integrated ▁state ▁called ▁Den mark – N or way ▁by ▁modern ▁histor ians , ▁at ▁the ▁time ▁sometimes ▁referred ▁to ▁as ▁the ▁" T win ▁Kingdom s ", ▁" the ▁Mon archy ", ▁or ▁simply ▁" H is ▁Majesty ". ▁Prior ▁to ▁ 1 6 6 0 , ▁Den mark – N or way ▁was ▁de ▁j ure ▁a ▁constitution al ▁and ▁elect ive ▁mon archy ▁in ▁which ▁the ▁King ' s ▁power ▁was ▁somewhat ▁limited ; ▁in ▁that ▁year ▁it ▁became ▁one ▁of ▁the ▁most ▁string ent ▁absolute ▁monarch ies ▁in ▁Europe . ▁Even ▁after ▁ 1 6 6 0 , ▁Den mark – N or way ▁consisted ▁of ▁three ▁formally ▁separate ▁parts , ▁and ▁Norway ▁kept ▁its ▁separate ▁laws ▁and ▁some ▁institutions , ▁and ▁separate ▁coin age ▁and ▁army . ▁ ▁The ▁D ano - N or weg ian ▁union ▁last ed ▁until ▁ 1 8 1 4 , ▁when ▁the ▁Tre aty ▁of ▁K iel ▁decre ed ▁that ▁Norway ▁( except ▁for ▁the ▁Far oe ▁Islands , ▁I cel and , ▁and ▁Green land ) ▁be ▁c eded ▁to ▁Sweden . ▁The ▁treat y ▁however , ▁was ▁not ▁recogn ised ▁by ▁Norway , ▁which ▁successfully ▁resist ed ▁the ▁attempt ▁in ▁the ▁ 1 8 1 4 ▁Swedish – N or weg ian ▁War . ▁Norway ▁there after ▁entered ▁into ▁a ▁much ▁lo oser ▁personal ▁union ▁with ▁Sweden