Queen Elizabeth II, Britain's longest-reigning monarch, passed away at Balmoral Castle at the age of 96, after seventy years in power.
In a statement, Buckingham Palace said: "In peace, the Queen passed away at Balmoral just after midday."
The statement added that "Prince Charles (the former crown prince) is scheduled to spend his night in Balmoral, and will return to London tomorrow."
Her son, the new King Charles III, said that "the moment of the death of my beloved mother, Her Majesty the Queen, is one of the saddest moments for me and all the members of my family," and that her passing "will send sadness around the world."
Senior members of the royal family met at the late Queen's residence in Scotland, after concerns about her health rose earlier today, Thursday.
The Queen ascended to the throne in 1952 and her era witnessed tremendous social changes.
The new king said: “It is with deep sadness that we mourn the passing of a beloved queen and a dear mother. I know that the grief of her passing will pervade Britain and the countries of the Commonwealth of Nations, and will be felt by countless people around the world.”
He added that, during mourning and change, he and his family members would seek "solace and consolation in standing for the respect and love of his late mother, the late Queen."
The late Queen's grandson Prince William came to the castle while his brother Prince Harry was on his way there.
Prime Minister Liz Terrace, who was appointed by the Queen on Tuesday, said the Queen was the foundation upon which modern Britain was built, and that she "gave us the stability and strength we needed".
Regarding the new king, Teras said: “We pledge allegiance to him on loyalty and devotion, just as his mother gave so much, to so many, for so long.”
"With the passing of the second Elizabethan era, we enter a new era in the rich history of our great country, just as Her Majesty wished, when she said, 'God save the King'," she added.
Queen Elizabeth II led Britain in very difficult times, such as after the war, with austerity measures; the transition from the Empire to the Federation of the Commonwealth; the end of the Cold War; The United Kingdom's accession to and then the exit from the European Union.
15 British Prime Ministers have succeeded Queen Elizabeth II, the first of whom was Winston Churchill, born in 1874, and the last of whom was Liz Terrass, born 101 years later, who was appointed by the Queen earlier this week.
Elizabeth II ascended the throne in 1952 and became Britain's longest-reigning monarch, surpassing Queen Victoria.
Her era marked the end of the British Empire abroad. It was a symbol of stability and continuity in a changing world. Its era witnessed tremendous social changes.
At the age of ten, Lilith, as Elizabeth was known in the family, was heir to the throne in the custody of her father, King George VI.
Within three years, Britain was at war with Nazi Germany. Elizabeth and her younger sister, Princess Margaret, spent much of the war at Windsor Castle after their parents rejected proposals to evacuate them to Canada.
After turning 18, Elizabeth spent five months learning basic auto mechanics and driving skills.
"I'm beginning to understand the spirit of community that thrives in the face of adversity," she later said.
During the war, she exchanged letters with her third cousin, Philip, Prince of Greece, who was serving in the Royal Navy before their romance developed and they married at Westminster Abbey on November 20, 1947, earning the prince the title of Duke of Edinburgh.
Elizabeth later described him as a source of "my strength and survival" during the 74 years of marriage, before his death in 2021 at the age of 99.
Their first son, Charles, was born in 1948, then Princess Anne in 1950, Prince Andrew in 1960, and Prince Edward in 1964.
They all bore their parents eight grandchildren, who in turn produced 12 children.
In 1952, Princess Elizabeth of Kenya was representing the king who was ill, when Philip told her the urgent news of the king's death, and she immediately returned to London as the new queen.
Later, she recalled, "Everything happened very quickly, and one has to do everything in his power to do his best."
Elizabeth was crowned, in Westminster Abbey, on June 2, 1953, when she was twenty-seven, and was watched on television by a record number of viewers at the time, estimated at more than 20 million viewers.