Alexander de Dunbar & partner 
They had a son named Patrick.
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Children
Sir Patrick Dunbar
Patrick was born in 1304 in Dunbar Castle, East Lothian, Scotland.2 He died at the age of 47 on September 5th, 1351.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32637&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32513&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32513&style=TABLE