was revoked. He retired from public life until the establishment of Cromwell's Protectorate with its anti-Spanish foreign policy, of which he approved. In June 1657, Warwick carried the sword of state during Cromwell's second inauguration as Lord Protector. The following November, his grandson and heir Robert Rich married Cromwell's daughter Frances. Warwick died in April 1658, his death greatly lamented by Cromwell.
Bernard Capp, Cromwell's Navy, the Fleet and the English Revolution (Oxford 1989)
Sean Kelsey, Robert Rich, second earl of Warwick, Oxford DNB, 2004