Free company Wikipedia
A free company (sometimes called a great company) was a late medieval army of mercenaries acting independently of any government, and thus "free". They regularly made a living by plunder when they were not employed; in France they were the routiers and écorcheurs who operated outside the highly structured law of arms. The term "free company" is most applied to those companies of soldiers which formed after the Peace of Brétigny during the Hundred Years' War and were active mainly in France, but it has been applied to other companies, such as the Catalan Grand Company and companies that operated elsewhere, such as in Italy and the Holy Roman Empire.
The free companies, or companies of adventure, have been cited as a factor as strong as plague or famine in the reduction of Siena from a glorious rival of Florence to a second-rate power during the later fourteenth century; Siena spent 291,379 florins between 1342 and 1399 buying off the free companies. The White Company of John Hawkwood, probably the most famous free company, was active in Italy in the latter half of the fourteenth century.