Just an interesting fact.
When I was watching the opening ceremony of the Canadian Parliament, I learned that in Canada the formal head of state is the king.
Today, the king of Canada is Charles III, who is simultaneously the king of the United Kingdom, the king of Australia, and of 12 other independent countries in the world.
That is, one person is the formal head of state and the king of 15 countries in the world:
United Kingdom
Canada
Australia
New Zealand
Jamaica
The Bahamas
Belize
Grenada
Papua New Guinea
Saint Vincent and the Grenadines
Saint Lucia
Saint Kitts and Nevis
Antigua and Barbuda
Solomon Islands
Tuvalu
I didn't know it could be like this in the 21st century.