<P> The following is a list, ordered by length of reign, of the monarchs of the United Kingdom of Great Britain and Northern Ireland (1927--present), the United Kingdom of Great Britain and Ireland (1801--1927), the Kingdom of Great Britain (1707--1801), the Kingdom of England (871--1707), the Kingdom of Scotland (878--1707), the Kingdom of Ireland (1542--1800), and the Principality of Wales (1216--1542). </P> <P> Queen Elizabeth II became the longest - reigning British monarch on 9 September 2015 when she surpassed the reign of her great - great - grandmother Victoria . On 6 February 2017 she became the first British monarch to celebrate a sapphire jubilee, commemorating 65 years on the throne . </P> <P> These are the ten longest reigning monarchs in Britain for whom there is reliable recorded evidence . </P>

Who has been the longest reigning british monarch