Although betrothed to the Infanta Maria Anna of Spain, the engagement was broken off and prince Charles, the future King of England, married princess Henrietta Maria of France instead. A special dispensation for the wedding was required from the Pope as this was the first marriage of a Catholic princess to a Protestant prince - International politics at work! Their marriage was motivated by the political necessity of forging a relationship between England and France against the threat of the rising strength of Spain !
Henrietta Maria, now Charles' wife, however was a devout catholic - so much so that she had refused to be married by an English Bishop and, once married, did not attend Charles' Church of England coronation - seen as deliberately divisive actions by the Protestant portion England.
Her secretary was Sir John Wyntour, who had a house and business interests in the Forest of Dean. He, also, was a devout catholic, in a position of great power and over the years he was able to increase his holdings in the Forest - not always to its' short-term benefit.
Between them, Henrietta Maria and Sir John Wyntour, raised funds and arms for the King in return for the promise to remove the Recusant's Bill. This was a punitive act of parliament aimed at catholics who did not attend Church of England services.
With a family history of pro-Catholic intrigue (the Wyntours were involved in the Gunpowder Plot) and with the French Connection available they spent a lot of time and effort raising money, material and potential (Foreign) armies for the King.
Before the Civil War the Forest contained 105,537 trees - After the Civil War there were only 200 trees fit for navy timber. The King had granted the Forest to Sir John Wyntour for £10,000, and an annual fee farm rent of £2,000. The profits from stripping the Forest had mainly gone to the Catholic cause.