[1] Her father was Sir John King (died 1637) of Boyle, County Roscommon, Clerk of the Crown and Hanaper and a member of the Irish House of Commons, and her mother was Catherine Drury (died 1617), daughter of Robert Drury of Laughlin and Elizabeth Carew, and grand-niece of Sir William Drury, Lord President of Munster.
He sat in the Irish House of Commons as MP for Roscommon, and held numerous public offices.
Their daughter, Dora Katherina Dury (1654–77),[1] later became the second wife of Henry Oldenburg, also a younger member of the same Hartlib Circle in which John himself was so prominent, and the first secretary of the Royal Society.
[6] She exchanged letters with the theologian André Rivet concerning the role of women in religion and she corresponded with Lady Ranelagh, with whom she discussed both the education of girls and love in marriage.
John married Elizabeth Honeywood, daughter of Sir Robert Honywood of Charing in Kent and Frances Vane, daughter of Sir Henry Vane the Elder, and founded an enduring branch of the Moore family based at Drumbanagher House in County Armagh.