A tidy up of the FamilySearch Family Tree for Elizabeth FAMILTON and William RUNCIMAN's family led me to a suggested duplicate as a candidate to merge.
A William RUNCIMAN was indexed as marrying an Ann WESTMINSTER 20 May 1784 St Botolph, Aldersgate, London.
Who were they? Who was she?
The only candidate I had for William in this timeframe/place was married on the same day, same place, to an Elizabeth Campbell MILLINGTON.
The actual entry was re-checked from the London, England, Marriages and Banns, 1754-1921 images on ancestry from the London Metropolitan Archives.
William Runciman of the Parish of Saint Ann Westminster in the County of Middlesex a bachelor and Elizabeth Millington of this Parish Spinster .....
Answer: she doesn't exist.
But Elizabeth Campbell MILLINGTON did