In March he took Hillesden House in Buckinghamshire; in May was at the siege of Lincoln, when he repulsed Goring's attempt to relieve the town, and subsequently took part in Manchester's campaign in the north.
In November 1660 by his father's death he had become Viscount Valentia and Baron Mountnorris in the Irish peerage, and on the 20th April 1661 he was created Baron Annesley of Newport Pagnell in Buckinghamshire and earl of Anglesey in the peerage of Great Britain.
He married in this year Dorothy, daughter of Edward East of Bledlow in Buckinghamshire.
Buckingham House was built in 1705 for the duke of Buckinghamshire, and purchased by George III.
His family seems to have been strongly Puritan and was related to many of those Buckinghamshire families who were prominent in the parliamentary party.