Originally Posted by Furienna
That's not entirely correct. Carl XI and Gustaf IV Adolf both became kings as minors and thus already were monarchs at their weddings. They both married princesses though.
My comment was not about kings being monarchs when they got in general, just about the three Swedish kings who married Swedish commoners (Gustav, Erik, Johan). If kings are not seen as being royals because they are monarchs, there haven't been any marriage between a Swedish royal in line for the throne who have married a Swedish commoner and not lost his right to the throne after the accession of Gustav Vasa until Victoria married Daniel. Prince Bertil did marry a commoner, but princess Lilian was British, not Swedish.