“Article XVIII. ‘For as much as it seems convenient for the preservation, of the liberty of navigation and commerce in the Baltic Sea, that a firm and
exact friendship should be kept between the Kings of Sweden and Denmark and whereas the former Kings of Sweden and Denmark, did oblige themselves mutually, not only by the public Articles of Peace made in the camp of Copenhagen, on the 27th of May, 1660 and by the ratifications of the agreement interchanged on both