William was the only son of Evelyn Pierrepont, 5th Earl and 1st Duke of Kingston-upon-Hull. He was styled Viscount Newark until 1706, and thereafter Earl of Kingston. He died of smallpox, aged 20, in July 1713.
In 1711 he married Rachel Baynton (1695-1722), legal daughter of Thomas Baynton of Little Charfield, Wiltshire, but biological daughter and heiress of John Hall of Bradford, Wiltshire, and had:
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