Margaret Thatcher, the "Iron Lady" who dominated British politics for two decades, died on Monday following a stroke, a spokesperson for her family said. She was 87. Britain's only woman prime minister, the tough, outspoken Thatcher led the Conservatives to three election victories, governing from 1979 to 1990, the longest continuous period in office by a British prime minister since the early 19th century. Messages of condolences from all over the world are being received in UK in honour of this great leader, great Prime Minister and great Briton.