Sir John Colepeper was of a prominent family of Sussex and west Kent, in which latter county he served as a local magistrate from at least 1638. Elected for Rye in April 1640, he was returned again for the Kent in the Long Parliament, in whose first few days he presented a long statement of the ‘grievances of the Church and Commonwealth’ against the king’s policies. However, concerned by the growing radicalization of the populace, Colepeper had become by late 1641 one of Charles I’s leading supporters. From May 1642 he was constantly with the king as a principal adviser and in January 1643 was made master of the rolls, resigning the chancellorship of the exchequer to Sir Edward Hyde, later earl of Clarendon, the following month. Colepeper was disabled from the Commons and his estates in Kent and Sussex sequestered in early 1644. Charles I on 21 Oct. 1644 created him a baron, granting him estates in Thoresway in Lincolnshire and Kavenlice in Radnor. In March 1645 he was placed on the council of the prince of Wales, and accompanied the prince in his travels over the following years to the west of England, Jersey and finally to France.
For the next few years he was involved in the factional divisions at the court in exile, where he was often regarded as part of the Francophile ‘Louvre’ group opposed to the king’s chief adviser, Hyde. There are many suggestions in contemporary correspondence of conflict between the two councillors.
Colepeper also advised Hyde on the best management of legislation for the Restoration in May and June 1660.
