Margaret Hilda Thatcher , Baroness Thatcher , LG, OM, PC, FRS (October 13, 1925 - April 8, 2013) was Prime Minister of the United Kingdom from 1979 to 1990, and leader of the Conservative Party from 1975-1990. She was the longest-serving British Prime Minister in the twentieth century, the longest since William Gladstone, and had the longest continuous period in office since Lord Liverpool. She was also the only woman to become prime minister or elected leader of a major political party in the ... Biography Margaret Thatcher Margaret Thatcher (1925-2013) was Britain’s first female prime minister (1979-90). She was known for her tough uncompromising, conservative political views, and became dubbed as ‘The Iron Lady’. On the UK domestic front she instituted many free market reforms, implemented the controversial poll tax and reduced the power of trades unions. In international affairs, she cultivated a close relationship with American President Ronald Reagan and also developed a ... Margaret Thatcher was the first woman Prime Minister and the Conservative Party Leader of Britain. She became the first woman to hold the position of PM in Britain and thus got elected in the year 1979. Her tenure as a Prime Minister lasted from 1979 to 1990 as she resigned from the post due to some power struggles and unpopular policies in her party. During her tenure that lasted for three terms, she was successful in cutting down social welfare programs along with reducing trade union ... Most people who even remotely follow world politics can tell you that “The Iron Lady,” was Britain’s most controversial Prime Minister, Margaret Thatcher . While serving the Conservative party for over two decades, she was and is a divisive figure in European politics, and in her 11-year tenure as prime minister, she attracted both praise and criticism from both sides of the aisle. Who was Margaret Thatcher , and why is she still a common household name?