Below are verbatim excerpts from the entry for Clement Briggs in Great Migration: Immigrants to New England, 1620-1633 (Boston: New England Historic Genealogical Society; 1995) (1-3:234-236) with clarifying comments in {brackets}:
ORIGIN: Southwark, Surrey {place of emigration but not confirmed as place of birth}
MIGRATION: 1621 in Fortune
FIRST RESIDENCE: Plymouth
REMOVES: Weymouth by 1630
OCCUPATION: Fellmonger.
…
BIRTH: By about 1600 ( the deposition of 1638 implies that in 1616 Briggs had already been a servant of Mr. Samuel Latham for a few years).
DEATH: Weymouth by 23 February 1649[/9?] (date of inventory).
MARRIAGE: (1) By 1 March 1630/1 Joan Allen (1 March 1630/1: “Mr. Tho: Stoughton, constable of Dorchester, is fined L-5 for taking upon him to marry Clement Briggs & Joane Allen…” [MBCR 1:83])”
(2) By 1640 Elizabeth _____; she died between 11 November 1685 (date of codicil) and 11 August 1691 (probate of will), probably at Weymouth.
…
BIBILIOGRAPHIC NOTE: In 1966 Edna Anne Hannibal, with the assistance of Claude W. Barlow, published a solid genealogy… Clement Briggs of Plymouth Colony and His Descendants, 1621-1965.
<=== END OF VERBATIM EXCERPTS
Edna Anne Hannibal, Clement Briggs of Plymouth Colony and His Descendants, 1621-1965 (1966) is available online at:
http://www.seekingmyroots.com/members/files/G000790A.pdf
Joan (Allen) Briggs is frequently but incorrectly identified as the daughter of George Allen. Per Great Migration: Immigrants to New England, 1634-1635 (Boston: New England Historic Genealogical Society; 1999) (I:643-5), George Allen had no daughter named Joan (or variants) by either one of his wives.
The parents and origins of Clement Briggs and Joan (Allen) Briggs remain unknown.