The title of Baron Mowbray is a very old one in the Peerage of England, created by writ. It was held for a long time by the Mowbray and Howard Dukes of Norfolk. The title was united with the Barony of Segrave in 1368, when John Mowbray, 1st Earl of Nottingham and 5th Baron Mowbray succeeded to that title. Then, it became united with the Dukedom of Norfolk. The two titles were frequently separated due to the attainders of the Dukes of Norfolk, and were later reunited upon the Dukes' restorations. The final separation occurred with the death of the ninth Duke, when the barony of Mowbray fell into abeyance. Thereafter, it was united with the Barony of Stourton after it, and the barony of Segrave, were brought out of abeyance in the nineteenth century in favour of the twentieth Baron Stourton. The baronies of Mowbray and Segrave were shortly separated, as the barony of Segrave was called out of abeyance about two weeks after the barony of Mowbray.
William Barker was reputed to be descendent of Geoffrey de Mandeville, the 1st Earl of Sussex, contemporary of Robert Mowbray.
A descendent, Roger changed the name to Mowbray and was one of the 25 barons appointed to enforce the Magna Carta.
In July 1905 the private road from Mowbray Park to Picton via Thirlmere, which was constructed at the direction and expense of Manderville Barker, was given to the Government and officially gazetted in July 1905.
Lord Mowbray, Segrave and Stourton, who died on Tuesday aged 83, was the premier baron of England and the head of one of the oldest Roman Catholic families in the country.
A fine shot, Lord Mowbray was, for a time, captain of the House of Lords shooting team though, of the various clubs and associations to which he belonged, none gave him more pleasure than his membership of the Roxburghe Club, a select association of bibliophiles, founded in 1812.
He was the premier baron of England, because there was no Baron de Ros, Georgiana Maxwell, the most recent female to hold the title, was Baroness.