The earliest evidence for the Plant surname in England is found in proximity to the de Warenne descendants of Geffrey Plante Genest (1113-51), who was the eldest son of Fulk V, count of Anjou. Fulk V (1092-1143) had married the only daughter of Elias, count of Maine in 1109, thereby uniting Anjou and Maine; but Geffrey Plante Genest's mother, Eremburge died in 1126; and his subsequent step-mother, Mélisande, married Fulk V in 1129. It is Mélisande who provides the supposed family link to Plantard in the pseudo-history of the book The Holy Blood and the Holy Grail (HBHG).
HBHG draws heavily on the so-called Razes genealogy of Henri Lobineau, which includes Hughes de Plantard and which ends with Badouin (d 1118), king of Jerusalem as the brother of Godfroi de Bouillon. However, the authors of the HBHG then make a particularly inept family link to "the Plantagenet family", as indicated in the following extract from HBHG:
In 1131, he [Fulk V] married Godfroi de Bouillon's niece, the legendary Melusine, and became King of Jerusalem. According to the `Prieuré documents', the lords of Anjou - the Plantagenet family - were thus allied to the Merovingian bloodline.Though there is a linkage through successive kings of Jerusalem, the statement that this involved a niece of Godfroi is erroneous as follows:
In Gerald's story, an early count of Anjou returned from a journey with a woman, Melusine, famous for her beauty, whom he married. There were many strange things about her, the most shocking of which was that she was always absent from Mass at the consecration of the Host. Her true identity was discovered when her husband forced her to stay and see the body of Christ - a sight no evil sprirt could contemplate. Melusine flew screaming out of the window and was never seen again. She left behind two sons, from whom the later counts were descended.This story was associated with the saying "From the Devil they came and to the Devil they will return".
Notwithstanding these shortcomings, the HBHG adds:
The `Prieuré documents' furnished us with the most plausible - perhaps, indeed, the first plausible - genalogy of Godfroi de Bouillon that has yet come to light ... it convincingly bridged a number of perplexing historical gaps. According to the genealogy of the `Prieuré documents', Godfroi de Bouillon - by virtue of his great-grandmother, who married Hughes de Plantard in 1009 - was a lineal descendant of the Plantard family. In other words Godfroi was of Merovingian blood. ... In the ninth century the bloodline of Guillem de Gellone had culminated in the first dukes of Aquitaine. It also became aligned with the ducal house of Brittany. And in the tenth century a certain Hugues de Plantard - nicknamed `Long Nose' and a descendant of the bloodline of both Dagobert II and Guillem de Gellone - became the father of Eustache, first count of Boulogne. Eustache's grandson was Godfroi de Bouillon, Duke of Lorraine and conqeror of Jerusalem.Snippets of this are true; for example, it is generally accepted that Bernard Plantevelu of Aquitaine was a descendant of Guillem de Gelone [Nathaniel L Taylor (1997) in The American Genealogist, 72 pp. 203-221; see also J S Plant (2003) Plantevelu and the meaning of Plant in Roots and Branches, 26, pp. 23-41]; but, as the authors of HBHG themselves say, their account controversially bridges "a number of perplexing historical gaps".
There is quite direct evidence to link the Plant surname in England to the de Warenne descendants of Geffrey Plante Genest, though caution dictates that this could well be a cultural rather than a genetic connection. On the other hand, the HBHG invokes a long and tenuous family route to link an English bloodline Planta in England with Plantard in France and, in turn, with the Plantagenet family. This latter tenuous linkage of family connections is rightly debunked by serious academics, though perhaps the HBHG could be getting a little closer to the mark when it states: "And the name Plantagenet might even have been intended to echo the name `Plant-Ard' or Plantard". Even with this, the book seems to be missing the point however. There is a lack of evidence that the `Plantagenet family' were using Plantagenet as a surname before the mid-fifteenth century, though their forebear Geffrey had the nickname Plantegenest (or Plante Genest) by around the 1160s. It is specifically the name Plantevelu that may have come from the same culture as the later name Plante Genest (hence Plantagenet) [John S Plant (2005) Nomina, 28, pp. 115-133, esp. pp. 123-24]; but, that involves points of onomastics, semantics, and philosophy; and that is not the stuff of popular fiction.
The descent of Geffrey Plante Genest from the counts of Anjou is much less controversial:
Modern myth and the Plant bloodline