Freedom of the City of London
The Freedom of the City of London started around 1237 as the status of a 'free man' or 'citizen', protected by the charter of the City of London and not under the jurisdiction of a feudal lord. In the Middle Ages, this developed into a freedom or right to trade, becoming closely linked to the medieval guilds, the livery companies.
Source: Wikipedia — Freedom of the City of London (CC BY-SA 4.0)