I’ve disconnected from Barnaby “Bryan MacGill” Fitzpatrick, 5th Baron of Upper Ossory who died in 1641 & his wife Lady Margaret Butler
The false pedigree for Butler Thompson is seen in
”Americans of Royal Descent: A Collection of Genealogies of American Families ...” By Charles Henry Browning. Pedigree CIX. Page 429. [https://books.google.com/books?id=dIUaAAAAYAAJ&lpg=PA429&ot... GoogleBooks]
The authority for this line seems to be
Carrigan, William. The history and antiquities of the diocese of Ossory, Volume 1. (1905) p 98-99 [https://books.google.com/books?id=74QNAAAAYAAJ&lpg=PA100&dq... GoogleBooks]
Searching at Ancestry for records that might fit
https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=61865&... Buried 1677 at St Clements London
https://www.findagrave.com/memorial/160314601/edward-fitzpatrick
Edward Fitzpatrick d 1696
Several other remarkable personages were buried in the choir, but none of their monuments are now to be found. . . . 1696 -- November 9, the William packet boat, coming from Holyhead with 80 passengers, among whom was Brigadier Fitzpatrick and several other officers, was, by a violent storm, cast away near Sutton, in Dublin bay ; all persons, except the master and a boy, were lost ; the body of Brigadier Fitzpatrick was found upon the shore, which being brought to Dublin, was, on the 19th, honorably interred in the choir. . . . he was elder brother of Richard, first Lord Gowran, the son of which latter was created Earl of Upper Ossory. Archdall, Vol. II. pag. 346. The history and antiquities of the collegiate and cathedral church of St. Patrick near Dublin, from it foundation in 1190, to the year 1819: comprising a topographical account of the lands and parishes ... and biographical memoirs of its deans. Collected, chiefly, from sources of original record, by William Monck Mason, esq.
https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=61519&...
Edward Fitzpatrick d 1694
Obituaries prior to 1800; Author: Musgrave, William, Sir, 1735-1800; Armytage, George J., Sir, 1842-1918
https://en.wikisource.org/wiki/Fitzpatrick,_Richard_(d.1727)_(DNB00)_
FITZPATRICK, RICHARD, Lord Gowran (d. 1727), second son of John Fitzpatrick of Castletown, Queen's County, by Elizabeth, fourth daughter of Thomas, viscount Thurles, and relict of James Purcell, baron of Loughmore
In his 16] "Genealogical and Historical Notes on Culpepper County, Virginia", Dr. Phillip Slaughter, Culpepper, Virginia, Pages 2, &3, writes that her name was Jane Butler, sister to the Duke of Ormond. Charles Campbell says her name was Butler Bryan [pronounced Brain], daughter of Richard Bryan of Westminster, and her Christian name was after James Butler, Duke of Ormond, her Godfather.