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The King will say how "all nations are equal in this unique and voluntary association" which "is committed to developing free and democratic societies", and will also speak of the "existential threat" of climate change and its impact on Commonwealth nations.

While still heir to the throne, Charles surprised many at last year's summit of the Commonwealth - a voluntary association of countries that evolved from the British Empire - by acknowledging slavery's role in the organisation's roots.

Charles, then still the heir to the throne, surprised many at last year's summit of the Commonwealth, a voluntary association of countries that evolved from the British Empire, by acknowledging slavery's role in the organisation's roots.

The Commonwealth is a voluntary association of 56 independent countries, most of which have historical ties to the United Kingdom and its former empire.

It will be the third foreign trip by the royals since Charles became king following the death of his mother Queen Elizabeth in September last year, and their first to a nation in the Commonwealth, the voluntary association which he also heads.