The Wealth of Nations by Part 1 Chapter 10 Page 63

Both these regulations, though they have been confirmed by a public law of the kingdom, are evidently dictated by the same corporation spirit which enacted the bye-law of Sheffield. The silk weavers in London had scarce been incorporated a year when they enacted a bye-law restraining any master from having more than two apprentices at a time. It required a particular Act of Parliament to rescind this bye law.

Seven years seem anciently to have been, all over Europe, the usual term established for the duration of apprenticeships in the greater part of incorporated trades. All such incorporations were anciently called universities, which indeed is the proper Latin name for any incorporation whatever. The university of smiths, the university of tailors, etc., are expressions which we commonly meet with in the old charters of ancient towns.