Are you thinking of queen Margret? She was technically neither king nor queen of Sweden, only regent (apart from the time she and her husband were king and queen of Sweden for a brief period around 1360). Her son and later her grand nephew were the kings, and she was a regent during their minorities (and beyond in the case of Eric of Pomerania). To your point, however, her position as regent was nevertheless most commonly refered to by a male word: "husbonde".