Noting the distinction between the Plugenet family origins and that of Ralph Pluket (no Geni profile, that I'm aware of).
My interest is primarily in Ralph Pluket (Plochet, Ploquet, etc.), as he was somehow closely associated with the Denman family origins.
It was all too easy for me (with all the spelling variations and my own lack of familiarity) to confuse the two families. So now I shall go on record with an attempt to separately define the two surnames.
Little is known about either one, and Ralph Pluket had very few if any direct descendants (that I'm aware of). Most significantly, he was granted Dunham in Nottinghamshire, from Matthew, count of Boulogne. These lands were subsequently in the possession of Geoffrey de Dunham (from whom they were confiscated during Henry III). William de Denum appears later, during Edward III. ...Circa 1430, Robert Denham of Nottinghamshire. (I've seen inquisition post mortem transcript with both Denham and Denman as spelling variations of the exact same person, in the same document).
The latter was grandfather of Sir John Denman of Kirklington. The earliest Denman family resided mainly in Nottinghamshire, Derbyshire, and Yorkshire, branching out to Lincolnshire and other places. They were essentially Lancastrian (hope that makes sense). And one later branch produced both Lady Anne Hyde, queens Mary II and Anne, and Lord Thomas Denman (all my distant cousins).
So my focus has been on this family that seems somehow originating with the mysterious "Ralph Pluket of Dunham, Notts". I have found excellent corroborating records proving that he existed, etc. I also find that Roger de Busli/Builli at some point was a major Lord who owned much of the Honor of Lancaster, including Tickhill (home of the Denmans of New Hall) and pretty much everything else in the area. I'm not aware of any kinship between Roger de Busli and the Denman family.
"Nottinghamshire History, Family of Dunham" seems to imply that my Denman family who initially emigrated in 1620 to Massachusetts Colony from Scrooby (later bringing Judith Smead's Denman children over from England in 1635, after their father's death and her remarriage) -- may have been of Saxon ancestry. However, my father's yDNA is presumed to be Celtic, based on his recent pedigree, in comparison to other members of the family who were tested. But maybe Notts History is speaking only with regard to the place-name "Dunham", and that the family simply adopted that placename after receiving the grant for the land.
http://www.nottshistory.org.uk/monographs/dunham1924/dunham05.htm
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More is known about Hugh de Plugenet, as his son or grandson (I think) was Constable of Castle Corfe in Dorset. Plukenet Tower was built by him, and still bears his heraldic shield in stone on the tower wall. This family later became well established in Ireland where they were known as the Plunketts, etc. Unfortunately, after not finding my Ralph Pluket's Geni profile (which apparently doesn't exist yet), I made the mistake of confusing the two families. Oops, I am truly sorry about that. :/
But the good news is that now I understand that there is a huge difference, and have gained better footing for future research. It's very tempting to spend more time with the Plugenets, because I believe that branch is ripe for development and better connections. I found some enticing information about them, but haven't had much luck making solid pedigree connections. That whole area of the Tree needs a lot more serious detailing, which of course is very time-consuming work. Anyway, here are a couple of links to sources for "Plugenet/Plukenet/Plunkett". (Saving my "Pluket/Plochet/Ploquet" data for their future profile(s), if I ever find any solid connections for it.)
The Plugenet family intermarried (or were somehow associated) with the St. Johns, Fossards, and other prominent Normand families. Hawise, daughter of Hugh de Plugenet (her Geni profile does not exist at this time), married John St. John I of Stanton-St. John (ca.1100 - after 1160).
Thomas St. John, son of the above-mentioned John, married a daughter of William Fossard. And according to various sources, "Richilde, daughter and heiress of Reinald, Earl of Henault, was widow of Baldwin de Monte, called the Peace-maker. (See Rotulus de Dominabus, ed. Grimaldi, p. 15.) The heir of Gilbert de Monte had four uncles, Thomas and John de St. John, Hugh de Plugenet, and Will Fossard."
I couldn't find a profile for "Gilbert de Monte" (who I suspect may be the Gilbert, the Chronicler of Mons, for whom apparently there is no Geni profile).
So I also suspect that the Plugenets are close kin to the de Toeni family as well. They must have been pretty important at the time, for Alan de Plukenet to gain such fame as constable of Corfe. They may even have some royal blood, somewhere along the line.
https://www.stjohngenealogy.com/Newsletter/2019-10%20Volume%202%20I...
https://heltschl.org/Familie/Tattersall/pdfs/St_John_Genealogy_News...
https://archive.org/details/swallowfielditso00russ/page/4/mode/2up?...
https://www.academia.edu/43756912/DISCUSSION_DRAFT_The_Identity_and...
https://archive.org/details/normanpeopleand01unkngoog/page/n246/mod...
https://www.persee.fr/doc/bcrh_0770-6707_1857_num_25_9_2939
(In the above link, a pedigree chart with Richilde and her husband Baudouin de Mons, also an earlier Giselbert, although not the one I've been looking for).
https://www.google.com/books/edition/La_chronique_de_Gislebert_de_M...
(The above link is to a French language version of Gilbert of Mons' "Chronicle of Hainaut". I believe the author, who was born between 1140-1150, is the "Gilbert of Mons" whose heir was supposedly the nephew of Hugh Plugenet, William Fossard, and John and Thomas St. John of Stanton).
https://en.wikipedia.org/wiki/Gislebert_of_Mons
https://archive.org/details/battleabbeyrollw01battuoft/page/310/mod...
I think Hugh de Plugenet may be on the original Battle Abbey Roll (as Plunkenet, according to Burke). Catherine Lucy Wilhelmina Powlett, Duchess of Cleveland, stated: "Richard de la Bere, who was living in 1390...The son and namesake of this latter Richard, who likewise lived in the reign of Ed. II., succeeded to the estate of Alan Lord Plugenet as heir of the whole blood..."
https://archive.org/details/rollbattleabbey01burkgoog/page/n20/mode...
(Also on the roll are similar-sounding names: "Placy" and "Place" which is similar to my Plochet or Pluket; and "Peukeney" which with a French accent might be taken for the English form, Plugenet.