 In the reign of Berhtwulf of Mercia (c. 840–52) minting at London, Mercia's only remaining mint, began again in earnest, around the time of Æthelwulf's second phase of coinage in the mid 840s.A mixture of portrait and non-portrait types was struck.Because of the long abeyance of the London mint, considerable support came from West Saxon Rochester in the form of dies and even moneyers, and it is possible that some coins in Berhtwulf's name were actually produced in Rochester.