The <a href="https://en.wikipedia.org/wiki/Kalmar_Union" id="mwHw" rel="mw:WikiLink" title="Kalmar Union">Kalmar Union</a> is formed under the rule of <a href="https://en.wikipedia.org/wiki/Margaret_I_of_Denmark" id="mwIA" rel="mw:WikiLink" title="Margaret I of Denmark">Margaret I of Denmark</a>.