A candid photograph of Margaret Thatcher standing in front of the Houses of Parliament and Big Ben. Her confident smile and poised stance reflect the determination that earned her the title of Britain’s “Iron Lady.”Margaret Thatcher (1925–2013) was the United Kingdom’s first female Prime Minister, serving from 1979 to 1990. Known for her strong leadership, free-market policies, and resolute stance during the Cold War, she remains one of the most influential — and debated — political figures in modern British history.