Ramba uchiverenga ndima iyi - Kuti asarudzwe kuva mambo pashure pokufa kwababa vake, Frederick akabvuma simba guru kuvakuru vakuru. Samambo, akarwa hondo mbiri neSweden. Akakundwa muHondo yeDano-Swedish ya1657<unk>1658, asi akawana mukurumbira mukuru paakatsungirira 1659 Kurwiswa kweCopenhagen
uye akakunda Hondo yeDano-Swedish ya1658<unk>1660. Gare gare gore iroro, Frederick akashandisa mukurumbira wake kuparadza umambo hunosarudzwa achitsigira umambo hwakakwana, hwakagara kusvikira muna 1848 muDenmark. Akaroora Sophie Amalie weBrunswick-Lüneburg, waakabereka naye Christian V weDenmark.