Dear Newsgroup ~
Complete Peerage 1 (1910): 244–245 (sub Arundel); 10 (1945): 394–397 (sub Pembroke); and 11 (1949): 328-329 (sub Saint John) documents the marital history of Philippe Mortimer, daughter of Edmund de Mortimer, Knt., Earl of March and Ulster, by Philippe, daughter and heiress of Lionel of Antwerp, K.G., Duke of Clarence, 5th Earl of Ulster (son of King Edward III of England).
According to many publishes sources, Philippe married (1st) John de Hastings, Knt., 3rd Earl of Pembroke (died 30 or 31 Dec. 1389); (2nd) Richard de Arundel, K.G., Earl of Arundel and Surrey (beheaded 21 Sept. 1397); and (3rd) Thomas Poynings (alias Saint John), Knt., 5th Lord Saint John of Basing (died 7 March 1428/9).
The subject of this post is the death date of Philippe Mortimer which is given differently by the various accounts of Complete Peerage.
1. Complete Peerage 1 (1910): 244–245 (sub Arundel) states that Philippe Mortimer died "24 Sept. 1401, at Halnaker, Sussex, being buried at Boxgrove." END OF QUOTE.
No documentation is provided for this statement.
2. Complete Peerage 10 (1945): 394–397 (sub Pembroke) states that Philippe Mortimer died "24 Sept. 1401, at Halnaker, Sussex, and was buried at Boxgrove, near Lewes." END OF QUOTE.
No documentation is provided for this statement.
3. Complete Peerage 11 (1949): 328-329 (sub Saint John) states that Philippe Mortimer died 25 Sept. 1400 at Halnaker, and was buried in Boxgrove priory." END OF QUOTE.
The documentation cited for this information: Adam of Usk, Chron., pg. 55.
The source cited above by Complete Peerage for Philippe Mortimer's death date is found in Chronicon Adæ de Usk 1377–1421 (1904): 54-55, which may be viewed at the following weblink:
https://books.google.com/books?id=DoLSAAAAMAAJ&pg=PA54
Under the year 1400 the following information is recorded:
“Vijo kalendas Octobris [25 September], nobilissima domina mea, domina Philippa, domini met comitis Marchie filia, primo juveni probissimo comiti Penbrochie aput Wotstok in hastiludio perempto, et postea nobili comiti Arundelle decapitato, tercio domino de Seynt John conjugata, modicum postquam mihi ecclesiam de Westhanfeld, in Essexia, donaverat, nondum xxiiijtum etatis sue annum attingens, aput Halnakyt juxta Cicestriam, viam universe carnis est ingressa, et in prioratu de Bosgrove jacet tumulata.”).
The chronicle of Adam of Usk relates that Philippe Mortimer died 25 September 1400, at Halnaker, Sussex, and was buried at Boxgrove Priory, just as stated in the Saint John account in Complete Peerage. However, this date is obviously at variance with the date of her death provided in the Arundel and Pembroke accounts in Complete Peerage, namely 24 September 1401. Which of these two dates is correct?
Fortunately a full transcript of an inquisition post mortem for Philippe Mortimer is available in a little known source, Minutes of Evidence ... [re.] the Title & Dignity of Baron Hastings (1840): 67-69. This transcript can be viewed at the following weblink:
https://books.google.com/books?id=atcNAAAAQAAJ&pg=PA67
The inquisition was taken on Tuesday, 23 November 1400. It specifically states that Philippe died on the sabbath before the feast of St. Michael previous. That translates to the date 25 September 1400.
Thus the date of death recorded for Philippe Mortimer in the Chronicle of Adam of Usk is fully confirmed by the inquisition post mortem.
In summary, Complete Peerage under separate accounts gives two different death dates for Philippe Mortimer, namely 25 September 1400 and 24 September 1401. The Chronicle of Adam of Usk and an inquisition post mortem for Philippe Mortimer prove that she died 25 September 1400.
Best always, Douglas Richardson, Salt Lake City, Utah