He will hear condolences at Westminster before travelling to Edinburgh to mount a vigil for the Queen.
King Charles III is to speak to both Houses of Parliament for the first time as monarch.
At Westminster Hall - which is also where the Queen's coffin will lie in state later this week - speakers from both Houses of Parliament, Sir Lindsay Hoyle and Lord McFall, will address the King on behalf of the MPs and peers.Monday's visit to Westminster will also see members of both houses pledging loyalty to the new monarch.
His Majesty will lead members of the Royal Family - expected to include the Queen's other children the Princess Royal, Earl of Wessex and Duke of York - as they walk behind the Queen's coffin. At the cathedral, the Royal Family will be joined by a congregation drawn from all areas of Scottish society to attend a service of thanksgiving for her life.
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