Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers “To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall”. Thus a person with expertise in working with lead was first known as a Plumbarius.
The terms “skilled worker,” “craftsman,” “artisan,” and “tradesman” were used in senses that overlap. All describe people with specialized training in the skills needed for a particular kind of work. Some of them produced goods that they sold from their own premises (e.g., bootmakers, saddlers, hatmakers, jewelers, glassblowers); others (e.g., typesetters, bookbinders, wheelwrights) were employed to do one part of the production in a business that required a variety of skilled workers. Still others were factory hands who had become experts in some complex part of the process and could command high wages and steady employment. Skilled workers in the building trades (e.g., carpenters, masons, plumbers, painters, plasterers, glaziers) were also referred to by one or another of these terms." />