Magna Carta and London

From the Wikipedia page on Magna Carta

Magna Carta Libertatum (Medieval Latin for "the Great Charter of the Liberties"), commonly called Magna Carta (also Magna Charta; "Great Charter"), is a charter of rights agreed to by King John of England at Runnymede, near Windsor, on 15 June 1215.

Clause 13 states:

'And the city of London is to have all its ancient liberties and free customs, both on land and water. Moreover we wish and grant that all other cities, boroughs, towns and ports are to have all their liberties and free customs.'