William de Berkeley, 1st Marquess of Berkeley William de Berkeley, 1st Marquess of Berkeley William de Berkeley, 1st Marquess of Berkeley (1426 – 14 February 1492) was an English peer, given the epithet "The Waste-All" by the family biographer and steward John Smyth of Nibley. He was buried at "St. Augustine's Friars, London" according to one source, but most likely in the Berkeley family foundation of St Augustine's Abbey, Bristol. William of Berkley was born to James Berkeley, 1st Baron Berkeley, and Lady Isabel Mowbray at Berkeley Castle in Berkeley, Gloucestershire, in 1426. His first marriage was in 1466 to Elizabeth West, daughter of Reginald West, 6th
Thomas de Berkeley, 5th Baron Berkeley including in 1395 when he served jointly with Gilbert Denys. Nigel Saul states that such feoffees were likely to have been members of Lord Berkeley's retinue. These were very significant positions of trust granted to his feoffees as Berkeley died leaving only a daughter and the succession to the vast Berkeley lands, including the castle itself, became a matter of much dispute amongst his possible heirs resulting in a series of feuds which led in 1470 to the last private battle fought on English soil at the Battle of Nibley Green, between Lord William Berkeley and Viscount Lisle, and there