I've read Boddie's Southside Virginia Families.I have been told by several very careful researchers that Boddie is not totally correct.Also, I don't believe that Boddie actually states that Henry Briggs, the mathematician, was the father of the Henry Briggs and Thomas Briggs mentioned in the records of the Virginia Company of London. The only mention of that Henry Briggs in Virginia was sent with a packet of other letters from the colony of Virginia back to London and recorded in the records of the company. It has been surmised that Henry and Thomas could be related to the famous Henry Briggs because of the connection that the famous Henry Briggs had with the Company. (The brothers could even be nephews of the famous Henry Briggs, perhaps sons of Richard Briggs, the brother of the famous Henry Briggs.)There was indeed another Henry Briggs who had a son and daughter who lived in Clerkenwell (in London) but I can find no relationship between them and the famous Henry Briggs.The son and daughter of the Henry Briggs of Clerkenwell ended up in New England, not Virginia.The son was yet another Henry Briggs!
As I recall, Boddie did not actually say that the famous Henry Briggs was the father of the Henry Briggs who was active in Surry County, Virginia, in the 1660s. I know people keep giving dates of birth and place of birth for my ancestor Henry Briggs of Virginia, but I have never had anyone give me a primary source to back it up.So far, it all appears to be speculation.
I will try to find my photocopy of Southside Virginia Families to see exactly what Doddie wrote about Henry Briggs, father of my Samual Briggs and your Captain Henry Briggs.