Note: This history was written in 1866; this blog post doesn't necessarily account for any updates and/or corrections to the text below.
From the History of Norwich, Connecticut: From Its Possession by the Indians, to the ..., by Frances Manwaring Caulkins:
The brothers Matthew and Edward Griswold were natives of Kenilworth in Warwickshire, England.
Lieut. Francis Griswold, the Norwich proprietor, was a son of Edward and Margaret born about 1632. He appears to have been a man of capacity and enterprise and took an active part in the affairs of the plantation, serving as representative to the General Court for eleven sessions, beginning October 1664 and ending May 1671. It is not known when he was married or to whom. Not even the household name of his wife is found in the records at Saybrook or Norwich. At the former place is the following registry
Lieut. Griswold died the same month, October 1671, cut down apparently by some sudden attack of disease, leaving seven of the above named children, varying in age from an infant of days to eighteen years. Thomas Adgate and John Post, Sen., acted as guardians to the younger children. The daughters were very early provided with eligible partners. ... Mary to Jonathan Tracy July 11, 1672, second marriage to Eleazer Jewett...
Uncle Warren is a descendant, too, of Francis Griswold.