In his first national address as king, Charles III bestowed new titles on his son William and daughter-in-law Catherine, and expressed his love to youngest son Harry and his wife Meghan Markle.
On Friday evening, the 73-year-old addressed the nation for the first time as king in a pre-recorded message.
Speaking from Buckingham Palace, the new king started by saying: "I speak to you today with feelings of profound sorrow.
"Throughout her life, Her Majesty the Queen, my beloved mother, was an inspiration and example to me and to all my family.
"We owe her the most heartfelt debt any family could owe to their mother, for her love, affection, guidance, and example."
Addressing the great change his mother saw throughout her life, King Charles III said: "When The Queen came to the throne, Britain and the world were still coping with the privations and aftermath of the Second World War, and still living by the conventions of earlier times.
"In the course of the last 70 years we have seen our society become one of many cultures and many faiths.
"The institutions of the State have changed in turn. But, through all changes and challenges, our nation and the wider family of Realms - of whose talents, traditions and achievements I am so inexpressibly proud - have prospered and flourished.
"Our values have remained, and must remain, constant. The role and the duties of Monarchy also remain, as does the Sovereign's particular relationship and responsibility towards the Church of England - the Church in which my own faith is so deeply rooted."
Reflecting on his late mother's dedication to the throne, King Charles said that he would do the same, saying: "As the Queen herself did with such unswerving devotion, I too now solemnly pledge myself throughout he remaining time God grants me, to uphold the constitutional principles at the heart of our nation.
"Wherever you may live in the United Kingdom or in the realms and territories across the world and whatever maybe your background and beliefs I shall endeavour to serve you with loyalty, respect and love, as I have throughout my life."
King Charles III then announced that his eldest son and heir apparent, William, would become the new Prince of Wales, with wife Catherine becoming the new Princess of Wales.
"With Catherine beside him, our new Prince and Princess of Wales will, I know, continue to inspire and lead our national conversations, helping to bring the marginal to the center ground where vital help can be given."
Speaking about his youngest son and daughter-in-law Meghan, King Charles III said: "I express my love for Prince Harry and Meghan as they continue to build their lives overseas."
The new king concluded his address with a heartwarming message to his late mother, saying: "And to my darling Mama, as you begin your last great journey to join my dear late Papa, I want simply to say this: thank you.
"Thank you for your love and devotion to our family and to the family of nations you have served so diligently all these years.
"May 'flights of Angels sing thee to thy rest'."
The address was aired as part of a special Thanksgiving of Service for Queen Elizabeth II at St. Paul's Cathedral. The event is attended by senior politicians and 2,000 members of the public.
Per the Financial Times, the message was recorded in the grand Blue Drawing Room in Buckingham Palace.
King Charles III - along with his wife and the new Queen Consort, Camilla - flew from Scotland to London earlier today, arriving at Buckingham Palace this afternoon. The new king and queen were greeted by hundreds of well-wishers, with cries of "long live the king" breaking out.
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