Berkeley family Constable (Alnod), a high official under King Edward the Confessor. Berkeley Castle, the "caput" of the barony, and the adjoining town of Berkeley are located in the county of Gloucestershire and are situated about five miles west of Dursley and eighteen miles southwest of Gloucester, and northeast of Bristol. The location has conferred various titles on the family over the centuries, including Baron Berkeley (barony by writ), Earl of Berkeley, and Marquess of Berkeley. Berkeley Castle was originally granted by William the Conqueror to the Norman Roger de Berkeley, feudal baron of Dursley, under the feudal tenure of fee-farm. However,
Margaret Mortimer, Baroness Berkeley Margaret Mortimer, Baroness Berkeley Margaret Mortimer, Baroness Berkeley (2 May 1304 – 5 May 1337) was the wife of Thomas de Berkeley, 3rd Baron Berkeley. She was the eldest daughter of Roger Mortimer, 1st Earl of March, the "de facto" ruler of England from 1327 to 1330, and his wife Joan de Geneville, Baroness Geneville. Margaret Mortimer was the eldest of the twelve children of Roger Mortimer, 1st Earl of March and Joan de Geneville, Baroness Geneville. Her paternal grandparents were Edmund Mortimer, 2nd Baron Mortimer and Margaret de Fiennes. Her maternal grandparents were Piers de Geneville, of Trim Castle