John II had to pay three million écus for his ransom, and would be released after he paid one million. The occasion was the first minting of the franc, equivalent to one livre tournois (twenty sous). As a guarantee for the payment of his ransom, John gave as hostages two of his sons, Louis I, Duke of Anjou and John, Duke of Berry, several princes and nobles, four inhabitants of Paris, and two citizens from each of the nineteen principal towns of France. This treaty was ratified and sworn to by the two kings and by their eldest sons, Edward, the Black Prince and the dauphin Charles on 24 October 1360 at Calais. At the same time, the special conditions relating to each important article of the treaty and the renunciatory clauses in which the kings abandoned their rights over the territory they had yielded to one another were signed. Edward III retired finally to England.