Who married Arthur Jones, 2nd Viscount Ranelagh?

Arthur Jones, 2nd Viscount Ranelagh (died 1669) was an Irish peer and politician who sat in both the Irish House of Commons and the English House of Commons.

Katherine Jones, Viscountess Ranelagh (22 March 1615 – 23 December 1691), also known as Lady Ranelagh, was an Anglo-Irish scientist in seventeenth-century Ireland and England. She was also a political and religious philosopher, and a member of many intellectual circles including the Hartlib Circle, the Great Tew Circle, and the Invisible College. Her correspondents included Samuel Hartlib, Edward Hyde, William Laud (the Archbishop of Canterbury), Thomas Hyde, and John Milton. She was the sister of Robert Boyle and is thought to have been a great influence on his work in chemistry. In her own right, she was a political and social figure closely connected to the Hartlib Circle. Lady Ranelagh held a London salon during the 1650s, much frequented by virtuosi associated with Hartlib.