Upon arriving at the community hub, Charles appeared unfazed by the claims and digs made by the Duke and Duchess of Sussex in the three episodes released by Netflix of the docu-series Harry & Meghan.
However, he seemed to show some sadness while speaking with his hosts.
In photos taken during the engagement, the King looked teary-eyed.
As he entered King’s House, Charles was asked by a member of the public whether he had seen the Sussexes’ docu-series.
King Charles did not respond to the question and, while continuing to walk, he waved at the crowds nearby.
The documentary, directed by Liz Garbus, included Prince Harry speaking about his love for Africa and how there he has found a “second family” and close friends who “literally brought me up”.
The Duke told the filmmakers: “Lesotho gave me the space and the freedom… to breathe, to live… and to grow.
“I went to Africa, sometimes three months at a time. Botswana is a country very close to my heart.
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“The fact that I spend more time here than at home worries my father a lot.”
He added: “I’ve got a second family out there. A group of friends that literally brought me up.
“For me, it’s always been quite special. So it was absolutely critical to share it with Meg.”