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.
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Descent and Marriages
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 Baron De La Warr, but he obtained a divorce on 20 November 1467. In November 1468, he married Joan Strangeways, daughter of Sir Thomas Strangeways and Lady Katherine Neville. After the death of his second wife, he married Anne Fiennes, sister of Thomas Fiennes, 8th Baron Dacre, in c. 1486.
Titles
William was invested as a knight c. 1438. William assumed the title of Baron Berkeley by writ after the death of his father James Berkeley, 1st Baron Berkeley on 22 October 1463.
He was invested as a Knight Bachelor on 18 April 1475. He was styled as Viscount of Catherlough (now known as County Carlow, Ireland) between 1481 and 10 February 1485.



