I have a Samuel Briggs m. to Bennett Ellis, with a son John m. to Ruth Barrow. I have no definite Dates, but it would be in early to mid-1600s. They first may have been first at Plymouth, but lived in Sandwich on Cape Cod at the time (which was also in Plymouth Plantation or County then). Both Briggs and Ellis families lived in Sandwich. Samuel's granddaughter Elizabeth married David Nye (an old Sandwich family), and they later lived in Marshfield, MA at the time of the RevWar (he served as a minuteman when 69 years old). Could this be your Briggs?