Doesn't the article by Professor Glyn Roberts (Dictionary of Welsh Biography (1959), GRIFFITH OF PENRHYN (Caerns.)) actually support the "traditional" pedigree? ("His son by his first wife inherited only his mother's property at Penmynydd..") It is dated 1959 and in 1957 Professor Roberts originally wrote his "Teulu Penmynydd" essay mentioned by Chris Pitt Lewis (though it was published in Transactions of the Honourable Society of Cymmrodorion in 1959). He had written an earlier essay (in English) "Wyrion Eden" in 1951, in which he had adopted the version of John Williams (1869) but he amended this in Teulu Penmynydd. In a footnote to the essay, as printed in Aspects of Welsh History (University of Wales Press, 1969), he explained [translated]:
"In Wyrion Eden... I followed the suggestion of John Williams (Arch Camb. 1869 page 379) that Tudur Fychan, ancestor of the later Penmynydd Tudors, was a son of Goronwy ap Tudur (died 1382). But J. R. Jones, op cit, showed a misreading of Ancient Petitions, V, 13604, where one has definite proof that Tudur Fychan was a son of Gwilym ap Gruffudd and Morfudd". (The op cit was the1953 M.A. thesis by J. Rowland Jones "The Development of the Penrhyn Estate to 1431".)
The documents he referred to can be seen online (as A.13604) in Descriptive Catalogue of Ancient Deeds, volume V) at
https://archive.org/details/descriptivecatal05greauoft/page/548 et seq.
However Professor Roberts also went on to say [translated]:
"It must be that Tudur Fychan was born 1385-90; the death of Owain Tudur Fychan in 1504-5 is a definite fact. Conjecturing that Tudur would be about 50 years old in the year of his son's birth, and the son over 60 when dying in 1504, the combination of dates is not impossible but there is a temptation to suppose that a generation is missing somewhere."
Also, in "Gwilym ap Gruffudd and the Rise of the Penrhyn Estate" (by A. D. Carr in Welsh History Review, vol. 15 No. 1 (June 1990), pages 1-20 at page 8) reference is made to a writ dated 13 October 1405:
".... and it reveals that the original was dated 13 October 1405 and that in it Gwilym's son Tudur Fychan, his father and his mother Generys were all named twice and that it also includes his brother Rhys. The same document includes an exemplification of an inquisition dated 9 November 1406 which found that Tudur, the son and heir of Gwilym and Morfudd, formerly his wife, was under age and a rebel and was seised of the manor and of half the township of Penmynydd and half the township of Dinsilwy [and other properties]. This inquisition indicates that Tudur Fychan was born after 1385 and that Morfudd was now dead."
(The 1385-90 date for Tudur Fychan's birth was evidently used in Teulu Penmynydd because Gwilym's son was old enough to have taken part in the Owain Glyn Dŵr rebellion, albeit being a minor in 1406.)
To justify the "certain proof" that he died in 1404-1405, Professor Roberts used a curious source: "an abstract of the inquisitio post mortem in The Taylors Cussion (ed. E. M. Pritchard) (1906), Part II, folio 7". The book comprises facsimile reproductions of notes made by George Owen, Lord of Kemeys (circa 1552-1613) who, according to the introduction, was an antiquary, author and general collector of information of all sorts. Surprisingly, the book is available at
archive.org and the relevant page in the online version is 274
(
https://archive.org/details/taylorscussion00owengoog/page/n273 )
I cannot decipher all of it but it seems to me to to purport to be a note (two notes actually) of a record that Owinus Tud Vichan of the manor of "penmynyth" died in the 20th Henry VII (Aug 1404-Aug 1405) (or perhaps the record was made in that year?) and that he had sons William, John and Richard, and Richard was his heir.
J. E. Griffith (Pedigrees of Anglesey and Carnarvonshire [sic] Families (1914)) under Plas Penmynydd at page 106/107 has "Tudur Vychan" as the son of "Gwilim ap Gruffydd" by his first marriage and as father of "Owen Tudor Vychan". Against Tudur Vychan he recorded "an imbecile, see Angharad Llwyd History of Mona p.335"; against "Owen Tudor Vychan" he recorded "esquire of the body to Henry VII" (without giving a source). Regarding the first note, Angharad Llwyd, in her book History of the Island of Mona, quoting from a "Salisbury Pedigree" said that Tudur Vychan was "an imbecile who did not receive any of his father's lands only the land of his mother". (Evidently his imbecility came late in life or perhaps it it was just wrongly assumed that imbecility was the cause of his being disinherited.) Regarding the second note, if it is correct, it would be evidence that Owen was alive in 1485 and so not inconsistent with his dying in 1504/5. But the pedigree also shows "Owen Tudor Vychan" to have been the father of Richard, William, John and also Hugh, the eldest being Richard Owen Tudur (consistent with the note in The Taylors Cussion), but recording that Richard was High Sheriff of Anglesey in 1565. (This must surely be wrong - the High Sheriff must have been of the next generation.)
Is it possible that the Owain ap Tudur Fychan who died in 1504/5 was actually a grandson of Tudur ap Gwilym ap Gruffudd Fychan, his father being the Tudur who was Gwilym ap Gruffudd's son? That would make the generation gap unexceptional and it would also explain why he had the epithet Fychan (the younger) when Gwilym's son Tudur did not have the name in his recent ancestry (though perhaps it may have reflected the contemporary existence until his death, before 1400, of his maternal uncle Tudur ap Goronwy).
Although A. D. Carr says that the writ of 13 October 1405 refers to Gwilym's son "Tudur Fychan", this may have been the author's identification rather than a direct quote from the writ, because the abstract of the document in the online catalogue of Penrhyn Estate documents at Bangor University merely describes him as "Tud'", though the abstract omits names which A. D. Carr says were in the original document so perhaps it is incomplete:
[Dated 06 April 1414] "Letters Patent of Henry VI being an exemplification of a writ of exigent (dated October 13, 1405- September 29, 1406) against Owen of Glynrody [Owain Glyndwr], [and many others] ... that Tud’ son and heir of William ap Gruff ap Willym and Morvyth formerly his wife being under age and a rebel abiding in association with Owen of Glyndordy [Owain Glyndwr] in Wales is seised in his demesne and as of fee of the Manor and half township of Penmynyth and half the township of Dynsylwy valued at 6 marks p.a. and that the same Tud’ ap Willym ap Gruff, rebel, has one mill called Melyn Vraynt valued at 10s p.a. and has a fourth part of the mill of G[e]reynt valued at 40d. p.a."
(
http://calmview.bangor.ac.uk/CalmView/Record.aspx?src=CalmView.Catalog&id=PFA%2f14%2f1%2f9%2f1&pos=5 )
Unfortunately the catalogue does not include the Inquisition he mentioned.
If he was called Tudur Fychan in a contemporary document the uncomfortably long generation span identified by Professor Glyn Roberts must presumably be correct.
(As for the disinheritance of Tudur ap Gwilym, A. D. Carr (op cit pages 11-12) refers to an entail and jointure in 1413 bringing it about, connected to the second marriage of his father, to Joan Stanley of the wealthy English Stanley family. He says that it was probably the price paid for the marriage, requiring preference to be given to a potential son of that family. It may also have been seen as disadvantageous for his son Tudur to inherit substantial estates given his participation in the rebellion.)
Alan Jones
http://yba.llgc.org.uk/en/s1-GRIF-PEN-1300.html (Dictionary of Welsh Biography)
https://journals.library.wales/view/1073091/1080900/0#?xywh=-896%2C-1%2C4172%2C3438 ("Gwilym ap Gruffudd and the Rise of the Penrhyn Estate")
https://archive.org/details/descriptivecatal05greauoft/page/548 (Catalogue of Ancient Deeds)