British Monarchy Records

Sharing Royal Facts

 

Lowest/Shortest

Shortest length of Reign

King Sweyn Forkbeard

40 days

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Youngest monarch at time of accession

Mary, Queen of Scots

6 days old

Mary,_Queen_of_Scots_after_Nicholas_Hill

Shortest length of marriage

Alexander III of Scotland & Yolande of Dreux

143 days

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Shortest (unofficial) length of reign

Lady Jane Grey

9 days

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

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youngest queen consort at the start of her reign

Isabella of Valois

(second wife of Richard II)

6 years 11 months and 25 days

Isabella_of_Valois_(1313-1388)_edited_ed

Lowest longevity of heir apparent

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

52 days

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