On May 12, 2011, Her Majesty Queen Elizabeth II became the second longest-reigning monarch in British history. Her reign has lasted 59 years and 96 days, overcoming the record previously held by her great-great-great-great-grandfather, King George III. George III reigned from 1760 until his death in 1820. He was king during the American Revolutionary War, and history has given him the nickname "Mad King George", as he spent the last ten years of his reign incapacitated by the blood disease porphyria.
The Queen is presently the longest-lived British monarch, having surpassed her great-great-grandmother Queen Victoria who reigned until the age of 81 (Elizabeth II celebrated her eighty-fifth birthday last month). The Queen is due to celebrate her Diamond Jubilee next year, commemorating sixty years on the throne, which will make her only the second monarch in Britain's history to celebrate a Diamond Jubilee. The last one was held for Queen Victoria in 1897. Should Elizabeth II continue to reign past September 11, 2015, she will surpass Victoria as the longest-reigning British monarch in history.