However, they are only one of 12 ruling monarchies on the continent, perMyLondon.

The only other European queen with this title is Queen Margrethe II of Denmark.

The first was Margaret I of Denmark, the daughter of Valdemar IV of Denmark.

Queen Margrethe smiling on royal visit in Germany

This was despite the Danish Act of Succession favoring a male heir.

But thanks to a certain change in law centuries later, Margrethe was crowned Queen of Denmark.

But why did this happen, and how did it help Margrethe become heir presumptive to the Danish monarchy?

Queen Margrethe at Fredensborg Palace

However, there was a catch.

After her father’s death, she was crowned queen of Denmark in 1972.

After a vote, an overwhelmingly large 84.6% of voters supported the change.

Crown Prince Frederik of Denmark, Crown Princess Mary of Denmark, Prince Christian of Denmark, Princess Isabella of Denmark, Princess Josephine of Denmark and Prince Vincent of Denmark during the confirmation of Princess Isabella of Denmark