A money changer is a person or organization whose business is the exchange of coins or currency of one country for that of another.
[3][4] With this Temple money the pilgrim would purchase a sacrificial animal, usually a pigeon or a lamb, in preparation for the following day's events.
During the Middle Ages in Europe, many cities and towns issued their own coins, often carrying the face of a ruler, such as the regional baron or bishop.
Money changers would assess a foreign coin for its type, wear and tear, and validity, then accept it as deposit, recording its value in local currency.
As the size and operations of money changers grew they began to provide a lending facility, by adding the lending-fee to the foreign exchange rates.