William de Combemartin was a medieval knight associated with Alderton and Stoke Bruerne. He died in 1318 and is commemorated by a surviving wooden effigy in St Margaret's Church, Alderton.

The 1307 grant and 1318 death are the principal securely reported facts used for this manor entry.

Research sources:
- Dorothy Macmillan, 'Our County Villages No. 46: Alderton', Northampton County Magazine, November 1932; the account also records the surviving effigy of Sir William de Combemartin at Alderton church. — https://www.mkheritage.org.uk/grafton/Alderton/Northampton%20County%20Magazine%20%20Nov1932.html