LONDON — Britain's Queen Elizabeth II died of old age, according to her death certificate, which was released Thursday.
The certificate says Elizabeth Alexandra Mary Windsor, 96, died at 3:10 p.m. (10:10 a.m. ET) on Sept. 8 at Balmoral Castle in eastern Scotland. The cause of death was listed as "old age."
Her occupation was listed as "Her Majesty The Queen."
Britain's longest-reigning monarch died hours after the palace revealed she had been placed under "medical supervision" at Balmoral, where the royal family rushed to be by her side.
The queen's death wasn't announced until 6:30 p.m. (1:30 p.m. ET), a seismic moment in British history that interrupted news broadcasts and launched 10 days of official national mourning.
A grand procession of events to mark her death was followed around the world, culminating in the solemn pageantry of her state funeral in London and her private burial at Windsor.
The certificate was released Thursday by National Records of Scotland, which confirmed that the registrar general for Scotland, Paul Lowe, registered her death in Aberdeenshire on Sept. 16.
The certificate was signed by Princess Anne, the queen's only daughter, who accompanied her body as it made its way from Scotland to London for its five days lying in state.
Thousands of mourners from around the world joined a line stretching more than 5 miles along London's River Thames to pay their respects and see the queen's coffin in Westminster Hall.
Queen Elizabeth was succeeded by her eldest son, Charles, 73, the former Prince of Wales, who now reigns as King Charles III.
Charles will be succeeded by his eldest son, Prince William.
Just two days before she died, the queen met with new Conservative Party leader Liz Truss at Balmoral, where she formally appointed Truss the 15th prime minister of her reign.
She had canceled several events this year, including the ceremonial State Opening of Parliament, because of what Buckingham Palace called “episodic mobility issues.”
She also broke with decades of tradition at the opening of her Platinum Jubilee celebrations this summer, when she took the salute from parading military members not at the Horse Guards Parade but from the balcony of the palace, instead.
She didn’t attend the Braemar Highland Gathering this month, a traditional sporting event in Scotland that she had attended every year since she ascended to the throne in 1952.
Last October, the queen spent a night in King Edward VII’s Hospital in London and was later advised by doctors to rest.
This article was originally published on NBCNews.com