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The Queen's 70-year reign is over.

Her eldest son, Prince Charles, is now the King of the United Kingdom, reports the BBC.

One of his first acts was to decide whether to rule as King Charles III or adopt another name.

For example, his grandfather George VI's first name was Albert, but he ruled under one of his middle names.

Charles can choose one of his four names - Charles Philip Arthur George.

He chose to rule under the name Charles III.

Who is Prince Charles - the heir to the throne of the United Kingdom

He's not the only one about to change his title.

Although he is the heir to the throne, Prince William will not automatically become the Prince of Wales.

However, he immediately inherited his father's other title - Duke of Cornwall.

His wife Catherine would be known as the Duchess of Cornwall.

Charles' wife will also be given a new title, with her full name being Queen Consort - the term "consort" being the monarch's wife.

Official ceremonies

In the first 24 hours or so after his mother's death, Charles will be officially proclaimed king.

It takes place at St. James's Palace in London before a ceremonial body known as the Council on the Ascension to the Throne.

Charles III