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Toss out those dates. They are not based on anything.
They are bad guesses, based solely on when his children and grandchildren
*died*.
Which is the worst kind of guess.
Come forward two generations and then start looking for *primary*
documentation, then you'll be on the right foot.
Will Johnson
FWIW (not necessarily very much), John Thwaites of Thwaites who
married as his 1st wife Joan Thornton is shown in one of several
pedigrees of various Thwaites families in "Yorkshire
Pedigrees" (edited by J. W. Walker), published as vol . 96 of the
Harleian Society's Visitation Series in 1944. Offhand I don't know
the provenance of this specific pedigree - you'd have to check the
cited volume for that.
This John Thwaites, who married 1st Joan, dau. of Robert Thornton and
2nd Isabellla, dau. of Sir William Ryther, is indicated as having a
will dated 22 Jan 1462, so it's very unlikely if not impossible that
he was born ca. 1360. In this pedigree John's father is said to be
Thomas Thwaites of Thwaites (no wife indicated) who was son of another
Thomas (of Harewood 1353 and of Gainsborough 1367) and his wife
Margaret.
Caveat lector....
I am not aware that the ancestry of John Thwaites is known but I have
a source that says he died in 1469.
Source: Thweatt, Silas Allen, Nine Hundred Years of Thweatt (Alhambra,
California, Alhambra Review Printing Company, 1959), P 26. "There was
a John Thwaites of Denton (temp) Henry VI, a lawyer of considerable
repute, who was legal advisor to Thomas, Lord Clifford. John Thwaites
died at Denton in 1469." From "Upper Wharfedale" by H. Speight, p.
175.
Louise
The 1469 would appear to be a guess as to when his 1462 Will was
actually probate. Evidently the year is not certain, perhaps the
original document is hard to read. You can see this uncertainty
mentioned here
http://books.google.com/books?id=TqJCAAAAYAAJ&pg=PA454#v=onepage&q=&f=false
in Dugdale's Visitation of Yorkshire, page 454
Will Johnson