Birthday of Margaret Thatcher (former UK Prime Minister), October 13. Margaret Thatcher was born on this day in 1925 in Grantham, Lincolnshire, England. She became the first woman to serve as Prime Minister of the United Kingdom, holding office from 1979 to 1990. Thatcher is known for her distinctive economic and social policies, often referred to as 'Thatcherism,' which played a significant role in shaping the political and economic landscape of late twentieth-century Britain. During her tenure, she implemented policies aimed at reducing the role of government in the economy, privatizing state-owned companies, and confronting trade unions. These measures had far-reaching effects on the British economy and society, leading to major structural changes. Thatcher was also active in foreign policy, notably leading the British government during the Falklands War in 1982. In that conflict, approximately 650 Argentine and 255 British military personnel lost their lives. The birthday of Margaret Thatcher is noted as a reminder of her role in modern British history and the impact of her policies on the country's society and economy. After stepping down as Prime Minister, Thatcher remained an influential figure in British politics and left behind numerous works and memoirs. This date was added to the Gregorian calendar to commemorate Margaret Thatcher's birth on October 13, 1925, and to recognize her historical significance in the United Kingdom.