1792 Elizabeth STALEY (LANKSHEAR) married Martin Ivens of  Northampton

from 1798 Will of Mary Lankshear of Witney

my daughter Elizabeth Ivens now Wife of Mr. Martin Ivens of Aston Co Walls in the County of Northampton

presumably Aston Le Walls which is 10km north of Banbury and near Upper & Lower Boddington and Chipping Warden

(checked IGI and could not find anything fitting)

But I think 1777 Elizabeth LANKSHEAR married John STALEY at Witney is also this daughter 

And the wording of the will is "now Wife" so it could well imply second marriage 
and/or a reason why she was not mentioned in her father's will  1792 Thomas Lankshear's Will

Marriage found 8/2008

From Len There are three entries for Martin IVENS in the Northants marriage index.

Martin IVENS of Eydon to Elizabeth STALEY 21 March 1792 at Aston Le Walls, license.

Martin IVENS of Eydon to Jane COWLEY otp 4 June 1835 at Kilsby

Martin IVENS otp to Mary WELLS otp 13 December 1827 at Charwelton

Nothing to indicate widow/widower/son.

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Found this man    
Martin Ivens - International Genealogical Index 
Birth:   Christening:  14 NOV 1756   Braunston, Northampton, England 
Father:  Thomas Ivens    Mother:  Sarah Bawcutt     
Record submitted after 1991 by a member of the LDS Church.  
 

Hugh Wallis's IGI leads Braunston into Rutland but no Ivens events on C150051   1701-1812   M150051   1701-1812  

Braunston is 13 miles from Aston le Walls

Plus I emailed a contact re IVENS surname on http://www.kellner.eclipse.co.uk/genuki/NTH/Surnames/names3.htm BUT Shirley had nothing on him

2/2008 another response on the message board from http://www.eydonhistoricalresearchgroup.org

saying they might have data - sent them a note