Quartered arms of Sir Thomas Grey, KG -- "quarterly": 1 and 4, barry of six, argent and azure, in chief three torteaux, with a label of three points ermine (for Grey); 2 and 3, sable six mullets, three, two, and one, argent pierced gules (for Bonville†); with a mullet for difference. †Sir Thomas was the third son of Thomas Grey, 1st Marquess of Dorset, KG, by his second wife, Cecily Bonville, 7th Baroness Harington of Aldingham and 2nd Baroness Bonville, the daughter and heiress of William Bonville, 6th Baron Harington.