King Sweyn Forkbeard

​

40 days

Shortest length of Reign

Mary, Queen of Scots

​

6 days old

Youngest monarch at time of accession

Alexander III of Scotland & Yolande of Dreux

​

143 days

Shortest length of marriage

Lady Jane Grey

​

9 days

​

although she was only proclaimed queen by the Lords of the Council on 10 July). The reign is disputed

Shortest (unofficial) length of reign

Isabella of Valois

(second wife of Richard II)

​

6 years 11 months and 25 days

youngest queen consort at the start of her reign

Henry, Duke of Cornwall, Son of Henry VIII & Katharine of Aragon

​

52 days

Lowest longevity of heir apparent

David II of Scotland

​

4 years of age

(to the 7 year old Joan of the Tower,)

Youngest monarch at time of marriage

Queen Victoria

​

1.52 metres (4 foot 9 inches)

Shortest (height) of monarch

Edward V

​

12

(most likely murdered along with his brother Richard)

The youngest Monarch to die

William II;  Edward V; Edward VI;

& Elizabeth I

all lived & died unmarried

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Edward VIII never married while he was king, but married after his abdication

Monarchs that never married