Elizabeth II's public duties began before her accession through wartime broadcasts, royal engagements and service in the Auxiliary Territorial Service in 1945. Marriage to Philip Mountbatten in 1947 and growing responsibilities as heir placed her within a monarchy adjusting to war's aftermath and imperial change. She became queen in February 1952 while visiting Kenya. The coronation in June 1953, widely televised, joined inherited ceremony with a rapidly expanding mass audience. Her role was constitutional: ministers governed, while she represented the state and carried out formal responsibilities on advice.

During seventy years on the throne she appointed prime ministers, opened Parliament, received diplomatic representatives and maintained regular audiences with heads of government. She worked with fifteen British prime ministers, from Winston Churchill to Liz Truss. Political neutrality helped sustain continuity across changes of party, but did not mean the monarchy stood outside public debate. Royal finances, institutional privileges and expectations of accountability remained contested. In other realms, her position was legally distinct from the British crown and depended on each country's constitutional arrangements.

Decolonization and the growth of the Commonwealth became defining settings for her international work. Extensive tours, state visits and meetings supported relationships among states whose experiences of empire differed sharply. The Commonwealth's voluntary character and inclusion of republics separated its headship from direct rule. Her later visits to places marked by historical conflict, including the Republic of Ireland in 2011, could carry symbolic significance without settling all underlying disputes. The institution she represented was repeatedly reinterpreted as public attitudes, media and the former empire changed.

Family controversies and events such as the 1992 Windsor fire and Diana's death in 1997 tested public confidence and prompted changes in presentation. Broadcasts, charitable patronage and ceremonial appearances continued to make the sovereign a familiar national figure. Jubilees marked both longevity and changing relationships between monarchy and society. Her Platinum Jubilee in 2022 celebrated seventy years, and she died at Balmoral that September, succeeded by Charles III. Her constitutional office endured profound change, while debates over inherited status and imperial legacy remained unresolved.