One other route to membership is by apprenticeship, but this has not happened recently. In the early days this was a very usual route; an apprentice would be 'bound' to a Member for a term of about seven years but in exchange the member was required to teach the apprentice such that he was worthy of membership by the end of the term, when he became a 'Freeman', for he was no longer bound. Freemen of a Livery Company are also Freemen of the City of London, which used to carry certain privileges, such as the right to drive a flock of sheep without charge over London Bridge.