A young man ‘of very good parts’, if ‘of a melancholic nature’, Portland took his seat in the House on 7 Apr. 1663 within a few weeks of succeeding to the peerage, though as with other peers who claimed places by descent the event went unnoticed in the Journal.
Besides his involvement in this business, Portland appears to have made little impact in the House. He proved loyal to his patron, Clarendon, and was noted by Philip Wharton, 4th Baron Wharton, as being opposed to the attempt made by George Digby, 2nd earl of Bristol, to impeach the lord chancellor. He may at a future date have been entrusted with the proxy of James Butler, duke of Ormond [I] (sitting as earl of Brecknock). If so, no record remains beyond a reference by Ormond over a year after Portland’s death, probably confusing him with his father, who had held Ormond’s proxy in 1662.
In his will, drawn up just a few days before his death, in which he named another kinsman, William Glascock‡, and Francis Bramston as his executors, Portland bequeathed his principal residence, Ashley House, to his mother. He made a few other modest bequests amounting to £230 and also made provision for an annuity of £40 to one Katherine Thoroughgood.
