Margaret St. John (1533-1562)

Note
It is assumed that Margaret married twice but neither of her husbands' family records referred to the other marriage.

stirnet.com makes her first husband Henry Grey (1520-1545), making her the mother of the 5th, 6th and 7th Earls of Kent.

thepeerage.com says that her first husband was William Gostwick (and don't know which Margaret St. John was Henry Grey's wife).

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