Upon becoming king, Charles was entitled by long-running tradition to choose to rule under any name with speculation he have chosen one of his middle names: Philip, Arthur or George.
Prime Minister Liz Truss was the first to publically acknowledge King’s chosen title Charles III.
Speaking outside Downing Street in response to the Queen’s passing, she said: “Today the Crown passes – as it is has done for more than a thousand years – to our new monarch, our new head of state: His Majesty King Charles III.
“With the King’s family, we mourn the loss of his mother. And as we mourn, we must come together as a people to support him.
“To help him bear the awesome responsibility that he now carries for us all. We offer him our loyalty and devotion just as his mother devoted so much to so many for so long.”