This is a biographic sketch found here, "KATHERINE KNYVETT (1564-September 8,1638) Katherine Knyvett was the daughter of Sir Henry Knyvett of Charlton, Wiltshire (1539-1598) and Elizabeth Stumpe (d.1585). She married first, Richard Rich (d. before February 27,1581), younger brother of the 3rd baron Rich, and then, in 1583, Thomas Howard (August 24,1561-May 28,1626). He was created baron Howard of Walden in 1597 and earl of Suffolk by James I. Katherine was rumored to have been Robert Cecil’s mistress, but there seems little foundation for the story. She was reputed to be a great beauty until a bout of smallpox in 1619. She and Thomas Howard had twelve children, including Theophilus (1584-1640), Thomas (d.1660), Elizabeth (1586-1658), Frances (May 31,1593-August 23,1632), Henry, Catherine (d.1672), Charles (d.1622), Robert (1598-1653), William (1600-1672), and Edward (d.1675). When their daughter Frances was tried for the murder of Thomas Overbury, the earl and countess of Suffolk were also brought before the Star Chamber. They were fined £30,000 and imprisoned until the fine was paid. Biography: Oxford DNB entry under 'Howard [née Knyvett; other married name Rich], Katherine.'" Her Wikipedia article that lists her children is here.
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