Earl of Roxburghe Robert Ker & Mary Maitland 
They had a son named Henry.
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Personal Details
Earl of Roxburghe Robert Ker
Robert was born in 1573 in Altonburn, Roxburghshire, Scotland.1 He died at the age of 77 on January 18th, 1650.1
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Children
Lord Henry Kerr
Henry was born in 1599 in Broughton, Mid-Lothian, Scotland.2 He died at the age of 43 on February 1st, 1642.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=shtritar&id=I79440
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=shtritar&id=I79440
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=shtritar&id=I79440