Queen Elizabeth II, the longest-reigning monarch in British history. She ascended to the throne and was crowned Queen at the tender age of 27. During her 70-year reign, Her Majesty worked with over a dozen Prime Ministers, each of whom formed successive governments on her behalf. As a high school dropout, the teenage John Major could simply never have dreamt that he would one day become a powerful political leader and get elected as Britain's Prime Minister. Major became Her Majesty's ninth Prime Minister, having fought for the leadership of the Conservative party after Margaret Thatcher's formidable 11-year premiership. But what would the Queen make of her new Prime Minister? Sir John Major, Her Majesty's 9th Prime Minister.