King Charles III has succeeded his mother, Queen Elizabeth II, following her death at Balmoral Castle, aged 96.
Earlier this year, the Queen celebrated her Platinum Jubilee, when she became the longest-serving British monarch.
The order of succession sets out which member of the Royal Family takes over as monarch when the existing one dies or abdicates. First in line - the heir to the throne - is the monarch's eldest child.
SOURCE: BBC