John III Knyvett & Elizabeth Clifton 
They had a son named John IV.
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Personal Details
John III Knyvett
John III was born about 1386 in Buckenham Castle, Norfolk, England. He died in 1446.
Elizabeth Clifton
Elizabeth was born about 1392 in Buckenham Castle, Norfolk, England. She died after 1447.
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Children
John IV Knyvett
John IV was born about 1422 in Buckingham Castle, Norfolk, England. He died in 1490 in Alternate YOD given..