Background
He was the eldest son of John Throckmorton Esq. (1580-1614/15) by Agnes Wilford. John"s grandfather was Sir Robert Throckmorton, Knight of the Order of the Garter(1513-1581), of Coughton Court, Warwickshire, and of Weston Underwood, Buckinghamshire, who unlike his brothers during the Reformation, one of whom, Job Throckmorton, became a puritan, adhered to the Roman Catholic faith, which religion was persisted in by his descendants until the 20th century.