Her mere presence illustrated the importance that she attaches to their deliberations, from Covid to climate change, at a period of great poignancy so soon after the death of Prince Philip who would have been 100 on Thursday.
And the Royal reception at the world-acclaimed Eden Project, a tourist attraction synonymous with the environment, was a fitting way to recognise the COP26 climate change summit taking place in Glasgow next year.
It was, in many respects, quiet diplomacy – so-called ‘soft power’ – at its finest and most adept as Britain pulls out all the stops to demonstrate the wider value of such summitry in the aftermath of the Trump years and pandemic.
The first time that the Queen has met any global leaders since the outbreak of Covid, this historic gathering was the prelude to another momentous weekend in Her Majesty’s unparalleled reign that begins with a scaled back Trooping the Colour ceremony in Windsor Castle to mark the monarch’s official birthday before hosting President Joe Biden and his wife Jill for afternoon tea tomorrow.
Yet the Queen’s determination to undertake such significant engagements, even at this time of great personal sorrow, is further testament to her devotion to duty as Britain, and the wider world, acknowledges how she remains, at the age of 95, such a source of stength to so many people and nations.