The Duke and Duchess of Cambridge, on behalf of The Queen, hosted a reception at Buckingham Palace to mark the UK-Africa Investment Summit in London.
A summit for leaders of 21 African countries in London was hosted by Prime Minister Boris Johnson earlier in the day.
At the summit, Johnson called for deeper investment ties between Britain and Africa, as part of a drive to develop trade links after the United Kingdom leaves the European Union at the end of the month.
At the reception, William spoke of his great affinity with the continent and of his hope to return to visit again with his family. He also used his speech to call on African nations to do their part in ending global warming.