Justification of the House of Anjou
The Plantagenet dynasty can be traced back in its direct male lineage to Gottfried Ferréol, who is attested in the 11th century as Count of the French countryside of Gâtinais. He was probably himself a member of the clan from which the vice counts of Châteaudun and counts of Le Perche had emerged. Through his marriage to the heiress of the county ofAnjou, Gottfried Ferréol secured for his descendants the possession of this feudal principality, which was already important in western France in his day. Already in the first half of the 12th century, the family rose to royal dignities, namely in the Crusader kingdom of Jerusalem.
After Anjou, the family was usually referred to simply as the "Angevin dynasty" or "House of Anjou" during the Middle Ages. It should not be confused with later dynasties of the same name, which descended from the French royal dynasty of the Capetians - for this, see older House of Anjou (Anjou-Capet) and younger House of Anjou (Valois-Anjou).
Count Gottfried Plantagenet
Count Gottfried V of Anjou († 1151), to whom chroniclers ascribed the epithet "Plantagenet" even during his lifetime, is considered the eponym and actual progenitor of the House of Plantagenet. This probably goes back to the count's habit of wearing a broom branch (Latin: planta genista; French: plante genêt) as a helmet decoration. However, it is also possible that the epithet derives from the fact that Gottfried planted gorse bushes on his estates to protect himself from view when hunting.
With Count Gottfried Plantagenet began the rise of his family to the leading dynasty in France alongside the Capetians, of which it was formally a vassal. Through his marriage to the heiress of the Anglo-Norman Empire, the "Empress" Matilda, the Angevins secured a claim to the Duchy of Normandy and the Kingdom of England, which they first had to assert against the House of Blois in a war of succession (The Anarchy), however. Gottfried Plantagenet conquered Normandy in 1144, and his son, after a treaty settlement with King Stephen in 1154, was finally able to ascend the English throne as King Henry II Short, which his descendants held continuously until 1485.
Throughout the High Middle Ages and into the Late Middle Ages, the name "Plantagenet" was applied solely in reference to Gottfried V of Anjou and not to the family descended from him. It was only during the Wars of the Roses (1455-1485), when the Angevin collateral lines of Lancaster and York were fighting for the crown of England, that this name was brought out to consolidate claims to rule. Duke Richard of York († 1460), head of the House of York, adopted the name Plantagenet in 1448 to bolster his claim to the throne against the ruling House of Lancaster. From then on, this name became retroactively accepted in historical literature for the entire royal dynasty from King Henry II onwards.