Katherine St. Clair 
Katherine was born about 1375 in Herdmanston,East Lothian,Scotland. Katherine's father was John St. Clair Of Polwarth and her mother was Heiress Elizabeth Polwarth. Her paternal grandparents were Lord John St. Clair Of Herdmanston and Margaret Sinclair. She had a brother named John. She was the older of the two children. She died after March 28th, 1450 in Seton,East Lothian,Scotland.1 General Notes
Burke's indicates that Katherine is daughter of a William Sinclair of Herdmanston. This could be a brother of John, who I show as father based on World Connect info. William might have stayed at Herdmanston while John went to Polwarth. John might also have been known as William. Burke's may be mistaken. Since I have found no reference to William other than Burke's, I will leave it as is for now.
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Ancestor Pedigree Chart
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- b.~ 1323 in Herdmanston,East Lothian,Scotland d.1377 in Herdmanston,East Lothian,Scotland
- b.> 1361 in Herdmanston,East Lothian,Scotland d.1402 in Polwarth,Berwickshire,Scotland
- b.~ 1330 in Rosslyn Castle,Roslin,Midlothian,Scotland
- b.~ 1375 in Herdmanston,East Lothian,Scotland d.>28 Mar 1450 in Seton,East Lothian,Scotland
- b.~ 1356 in Polwarth,Berwickshire,Scotland
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They had a son named William.
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Children
Sir William Seton
William was born about 1390 in Seton,East Lothian,Scotland. He died on August 17th, 1424 in Battle of Berneuil,France (on French side) (dvp).2
1 Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 955
2 Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 955
Further source/citation:
Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 955
2 Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 955
Further source/citation:
Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 955
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