Give a stream of consciousness and then the final answer. 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.\n\nWho has been the longest reigning british monarch?
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To answer this question, we should know that: Queen Elizabeth II became the longest-reigning British monarch on 9 September 2015 when she surpassed the reign of her great-great-grandmother Victoria.
So, the final answer is Queen Elizabeth II.
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