Brother of Henry Fanshawe.
Sir Thomas Fanshawe of Jenkins and Barking Manor (bpt 15 September 1580 - 17 December 1631) was an English politician and government official. He was a Member of Parliament for Bedford and subsequently Lancaster 1604-1622. http://wn.com/Thomas_Fanshawe_2nd_Viscount_Fansha…
FANSHAWE, THOMAS, second Viscount Fanshawe, in the peerage of Ireland (1639-1674), son of Sir Thomas Fanshawe, first viscount; M.A. Trinity College, Cambridge; K.B., 1661; remembrancer, 1665; M.P., Hertford, 1661-74.
---Dictionary of National Biography: Index and Epitome. S. Lee, 1906.
The father (the 1st Viscount Fanshawe) of Thomas and Henry was the brother of:
Sir Richard Fanshawe http://www.pepysdiary.com/encyclopedia/999/
Chart showing the number of references in each month of the diary’s entries.