As one of the twelve commissioners from the House of Commons who attended Charles II at Breda (7 May 1660), after Charles's accession Herbert was appointed warden of the Forest of Dean (18 June), and also on 30 July, in response to appeals from local gentry, lord lieutenant of Gloucestershire, Herefordshire, and Monmouthshire. The Monmouthshire estates, which he had obtained by reversion from Cromwell, were allowed to remain in his possession, though they should strictly have reverted to his father; the latter wrote to Lord Clarendon that his son was intriguing against him.