William Cotton was brought up in
Finchley,
Middlesex. He was the eldest son of John Cotton, a Citizen of the
City of London by his wife Pery Cheyne. John Cotton was the third son of Richard Cotton (died 1534) of
Hamstall Ridware in
Staffordshire, descended from William Cotton (fl.1378,1400) lord of the manor of Cotton in Cheshire, by his wife Agnes de Ridware, daughter and heiress of Walter de Ridware, lord of the manor of Hamstall Ridware. The junior branch of the Cotton family descended from Agnes de Ridware adopted the armorials of Ridware (
Azure, an eagle displayed argent) in lieu of their paternal arms of Cotton, which junior branch included
Sir Robert Cotton, 1st Baronet (1570–1631) of
Conington in Huntingdonshire, founder of the
Cottonian Library. The senior branch, of which Bishop Cotton was a member, retained the ancient arms of Cotton (
Argent, a bend sable between three pellets), as is visible on the monuments in Exeter Cathedral to Bishop William Cotton himself and on that of his grandson Edward Cotton (died 1675), Treasurer of Exeter Cathedral. ==Career==