In 1614 the College of Physicians appointed him to plead the immunity of the college from arms-bearing before the lord mayor, Sir Thomas Middleton, and the recorder, Sir Henry Montagu.
Manchester | Henry VIII of England | Manchester United F.C. | Henry VIII | Henry Kissinger | University of Manchester | Henry Wadsworth Longfellow | Henry II of England | Henry II | Henry III of England | Henry IV of France | Henry IV | Henry | Henry Ford | Henry James | Manchester City F.C. | Greater Manchester | Henry VII of England | Henry III | James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Horatio Nelson, 1st Viscount Nelson | Henry Moore | Henry Miller | Henry I of England | Henry Clay | Herbert Kitchener, 1st Earl Kitchener | Henry IV of England | Patrick Henry |
He was also the brother of Henry Montagu, later created Earl of Manchester, and of Sidney Montagu, ancestor of the Earls of Sandwich.
In 1642 he was presented by William Laud to the rectory of Allhallows, Bread Street; Laud made this presentation out of courtesy to Northumberland, and complained that, nonetheless, Henry Montagu, 1st Earl of Manchester, had written to pressure him, commanding him in the name of the House of Lords to give the benefice to Seaman.
Lord Portarlington married the Honourable Harriett Lydia, daughter of Henry Montagu, 6th Baron Rokeby, in 1855.