Katherine was born about 1375 in Herdmanston, East Lothian, Scotland, the daughter of sir John Sinclair and Elizabeth de Polwarth.
She died about 1450 in Seton, East Lothian, Scotland.
Her husband was sir John Seton. They were married, but the date and place have not been found. Their four known children were sir William (c1393-1424), Janet (?-?), Christian (?-?) and Marian (?-?).
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Katherine St. Clair |
sir John Sinclair |
sir John St. Clair |
William St. Clair |
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Margaret Gartney |
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Margaret Sinclair |
sir Henry Sinclair |
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Alice de Fenton |
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Elizabeth de Polwarth |
sir Patrick de Polwarth |
Alexander Seatoun de Wintoun |
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Agnes Hume |
Roger Hume |
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| Event | Date | Details | Source | Multimedia | Notes | ||
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| Birth | ABT 1375 |
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| Death | ABT 1450 |
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