Thursday marked a significant milestone for the Queen – as she entered the history books as Britain's second-longest serving monarch.
On May 12 the 85-year-old royal beats the record of King George III, who died in 1820, after spending 59 years and 97 days on the throne.
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She is second only to Queen Victoria, who reined for 63 years, seven months and three days.
Queen Elizabeth II celebrated the milestone by indulging in one of her favourite pastimes – her love of horses.
The monarch attended the Royal Windsor Horse Show in Windsor – which takes place in her private grounds