Consul (abbrev. cos.; Latin plural consules) was the title of one of the chief magistrates of the Roman Republic, and subsequently a somewhat significant title under the Roman Empire. The title was also used in other city states and also revived in modern states, notably in the First French Republic. The relating adjective is consular, from the consularis.
In modern terminology, a Consul is a type of diplomat. The American Heritage Dictionary defines consul as "an official appointed by a government to reside in a foreign country and represent its interests there."
In most governments, the Consul is the head of the Consular Section of an embassy, and is responsible for all consular services such as immigrant and non-immigrant visas, passports, and citizen services for expatriates living or traveling in the host country.
Throughout most of southern France, a consul (French: consul or consule) was an office equivalent to the échevins of the north and roughly similar with English aldermen. The most prominent were those of Bordeaux and Toulouse, which came to be known as jurats and capitouls, respectively. The capitouls of Toulouse were granted transmittable nobility. In many other smaller towns the first consul, was the equivalent of a mayor today, assisted by a variable number of secondary consuls and jurats. His main task was to levy and collect tax.
The Dukes of Gaeta often used also the title of "Consul" in its Greek form "Hypatos" (see List of Hypati and Dukes of Gaeta).