Mary is a descendant of a Magna Carta Surety on this line (Richardson 2005):

Roger Le Bigod, Earl of Norfolk & Ida __?__
_Hugh Le Bigod, Earl of Norfolk & Maud Marshall
__Isabel Le Bigod & John Fitz Geoffrey, Knt.
___Isabel Fitz John & Robert de Vipont
____Isabel de Vipont & Roger de Clifford
_____Robert de Clifford, Knt, 1st Lord Clifford & Maud de Clare
______Idoine de Clifford & Henry de Percy, K.G., 2nd Lord Percy
_______Isabel de Percy & William de Aton, Knt., 2nd Lord Aton
________Elizabeth de Aton & John de Conyers, Knt.
_________Robert CONYERS, Esq. & Isabel PERT
__________Alice CLERVAUX & John FAUNT, Esq.
___________William FAUNT & Isabel SAYER
____________William FAUNT, Esq. & Jane VINCENT
_____________Mary FAUNT

To have had a son as late as 1594, Mary must have been at least a decade, possibly two decades, younger than George, which raises the possibility that he had a prior wife.

1.  Douglas Richardson.  2005.  Magna Carta Ancestry:  A Study in Colonial and Medieval Families.  Genealogial Publ. Co., Baltimore, MD:

p. 233

15. MARY FAUNT, married GEORGE CORBIN, of Hallend and Polesworth, Warwickshire, son of Thomas Corbin, by his wife, Anne, daughter of William Repington.  He was born at Hallend, Warwickshire about 1543 (of age in 1564).  They had two sons, Henry and Thomas, and two daughters, Anne (wife of John Dawkins) and Jane (wife of James Prescott).  In 1564 George's father, Thomas Corbin, made a settlement of a cottage and land at Polesworth, Warwickshire in favor of George.  In 1568 he signed a deed relating to his cottage at Polesworth.  His wife, Mary, died in 1614.  GEORGE CORBIN died 26 Sept. 1636, and was buried at Kingswinford, Staffordshire. Nichols Hist. & Antiq. of Leicestershire 4(1) (1807): 175 (Faunt pedigree). Lennard & Vincent Vis. of Leicester 1619 (H.S.P. 2) (1870): 28 (Faunt pedigree: "Mary [Faunt] ux. Geo. Kerkin of Hallend in Warw.sh."). VMHB 28 (1920): 281-283, 370-373. Ligon Madresfield Muniments (1929): 50-59.

2.  Stella Pickett Hardy.  1911.  Colonial Families of the Southern States of America.  T.A. Wright, New York, NY (republished 1958, Southern Book Co., Baltimore, MD; republished 1965, Genealogical Publ. Co., Baltimore, MD).

p. 171	... 15-1.  THOMAS CORBIN, of "Hall End," Warwick Co., England; his son and heir,
p. 172	16-1.  GEORGE CORBIN, of "Hall End," Warwick Co., England; his son and heir... 17—1.  THOMAS CORBIN, of "Hall End," Warwick Co., England; b. May 24, 1594, at "Hall End"...

3a.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

3b.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

3c.  LDS.  Family Search: Internet Genealogy Service: Pedigree Resource File (index to CDs, online at FamilySearch.org).

4.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).