Crest: A Rock proper therefrom a Cornish Chough rising Sable the whole debruised with a Bendlet sinister wavy Ermine.

Supporters: On either side a Lion Or gorged with a Chain proper and pendant therefrom an Escutcheon, that of the dexter per fess Azure and Argent in chief a Naval Crown between two Laurel Branches saltirewise Or in base the Frame of a Vessel proper, that of the sinister Sable charged with five Bezants.

He was succeeded by his eldest son, the second Baron, who was a Colonel and Honorary Brigadier-General in the Grenadier Guards.

Sir Arthur James Dudley Stuart St Aubyn (1867–1897), second son of the first Baron.

The third baron was succeeded in 1978 by his eldest son, the fourth baron, who had served with the Royal Navy at Dunkirk and in a minesweeper in Arctic Convoys during World War II and was awarded the Distinguished Service Cross (DSC).