The Saybrook Colony was established in late 1635 at the mouth of the Connecticut River in what is today Old Saybrook, Connecticut and environs. The Connecticut River is the largest River in New England, flowing south from the Connecticut Lakes in northern New Hampshire, along the border Old Saybrook is a town in Middlesex County, Connecticut, United States. John Winthrop, the Younger, son of the Governor of Massachusetts, was designated Governor by the group that claimed possession of the land via a deed of conveyance from Robert Rich, 2nd Earl of Warwick. John Winthrop ( February 12, 1606 - April 5, 1676) generally known as John Winthrop the Younger, was Governor of Connecticut Robert Rich 2nd Earl of Warwick ( June 5 1587 &ndash 19 April 1658) was an English colonial administrator Admiral Winthrop was aided by Colonel George Fenwick and Captain Lion Gardiner. As the principals of the group who had planned to settle the colony were supporters of Oliver Cromwell and remained in England during the English Civil War, the colony struggled and by 1644, Fenwick agreed to merge the colony with the more vibrant Connecticut Colony a few miles up river. Oliver Cromwell (25 April 1599 Old Style &ndash 3 September 1658 Old Style) was an English military and political leader best known The English Civil War (1642-1651 was a series of armed conflicts and political machinations between Parliamentarians and Royalists. The Colony of Connecticut was an English colony that became the U