Hi Elaine
You can search for married women's names by both married name and maiden name, which helps to filter out many entries. There is only one entry I could see, but she is too young, a Jane Douglas/Con*er died 1879 age 53.
Two possibilities here:
1. She died between 1851-54, before official registration began in 1855 and there is no death cert for her on SP (have you checked the 1861 Census, this might show Robert as a widower).
2. If Robert died relatively young, she may have remarried and her death entry
might not show under Conquer.
Regards.
Monica
A couple of possible sisters for Robert:
1. MARY CONQUER Christening: 02 APR 1808 Garvald, East Lothian, Scotland
2. ELISABETH CONQUOR Christening: 08 JAN 1815 Morham, East Lothian, Scotland
And parents' marriage:
CHARLES CONQUER Marriages: Spouse: MARGARET ALAN
Marriage: 21 MAY 1805 Garvald, East Lothian, Scotland