[rubito]

I watched the Video but besides the "king entering the city ceremony" it didn't show what it makes it unique compared to other city states around the world.

[lozenge]

It's a city state without the state as it isn't internationally recognised.

[BillEllson]

The City of London is part of Greater London http://legislation.gov.uk/ukpga/1963/33/section/2 residents & businesses are subject to the same laws & taxes as the rest of England.

[easytiger]

well, arguably there are fewer than 5 city states in the world.