Extract from [Rice] Vaughan's Coin and Coinage [1615] on French currency changes 1417-23

the Engli{illeg}sh being in possession of the greatest part of france Charles the seventh having no other means to maintain the wars did from the yeare 1417 to the year 1423 raise the Silver by several degrees from 8 livres 9. sols the mark to 360 livres the mark so as the money was raised in 6 years above 40 times the value of what it was before — the truth is evident by records of the Mint, tho scarce mentiond by the Chronicles — that wch is as strange as the rest is, that at one instant the money was reduced against t{illeg}o 7 livres 10 Sols the mark
Vaughan of Coin & Coinage p. 231.