English: Armorial Bearings of the GILBERT family of Longtown, Herefs.

Arms: Sable, a leg in armour, couped at the thigh between two broken spears erect or, head argent.
Crest: An arm in armour embowed proper severed below the wrist, the hand dropping, grasping a broken spear as in the arms.

• Strong, George (1848) The Heraldry of Herefordshire: Being a Collection of the Armorial Bearings of Families Which Have Been Seated in the County at Various Periods Down to the Present Time., London: Churton Press

Also: (From: Magna Britannia: Volume 5, Derbyshire, London, 1817, General history: Gentry families extinct since 1500[1])

"Gilbert, of Locko. — This ancient family was originally of Gilbert's-place (fn. n11), in the parish of Lullington, where they appear to have been settled for twelve generations in the reign of Edward III. They were afterwards of Barrow. William Gilbert, Esq., of Barrow, purchased Locko in the reign of Queen Elizabeth. His descendant, John Gilbert, Esq., became possessed of Thurgarton Priory, in Nottinghamshire, by bequest from the Coopers, took the name of Cooper by act of parliament in 1736, and, having about the same time sold Locko, removed to Thurgarton. The representative of this family is John Gilbert Cooper, Esq., of Thurgarton Priory, who married the heiress of Roe: his father married a coheiress of Wright, of Leicester. The heiress of Saville, and coheiresses of Harpur and Bainbrigge, have married into this family. The heiress of a younger son of the Gilberts of Locko, settled at Mickle-Over, married Newton in the reign of Queen Elizabeth. Arms as confirmed by Dethick, Garter King of Arms, in 1576: —Sable, a leg armed in pale, between two shivered spears, Argent, the heads, Or. Crest: — A dexter arm embowed, in armour; the hand, Proper, darting a broken lance in bend sinister, the point Argent, the staft' Or."