Henry de Saint Clair & Margaret Grathenay 
They had a son named The Seemly.
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Children
William (The Seemly) de Sinclair
William, known as The Seemly, was born in 1145 in Rosslyn Castle, Rosslyn, Midlothian, Scotland.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=sbdcdonna1&id=I19151
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I131345&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I131345&style=TABLE