Geoffrey Plantagent and son Hamelin Plantagenet

Geoffrey V (Plantagenet), Count of Anjou had son Hamelin Plantagenet. Some think Hamelin's mother was Empress Matilda, and others say he was born from an affair. What we do know is Geoffrey fathered King Henry II, Geoffrey de Gatinais, Count of Nantes, William de Gatinais, Count of Poictou, Hamelin Plantagenet, Emma de Gatinais, and Mary de Gatinais.
Geoffrey was born Nov 24, 1113 and died Sept 7, 1151 at age 37. He is buried at Le Mans Cathedral, Maine, France
Geoffrey had the following titles:
Count of Maine (1126 - 1151)
Count of Anjou (1129 - 1151)
Duke of Normandy (1144 - 1149)
Geoffrey was 14 years old when he married Empress Matilda on June 17, 1128, she was 26 years old. She was the widow of Henry V, Holy Roman Emperor (Aug 11, 1086-May 23, 1125) who she married at age 12 (he was 27) on Jan 7, 1114.
Geoffrey was knighted by King Henry I on 10 June 1128, in Rouen.
Geoffrey's habit of wearing a sprig of broom plant (planta genesta) in his hat is the origin of the name "Plantagenet."
Geoffrey ceded his title as Duke of Normandy to his son Henry in 1149 (ratified by Louis VII in 1150).
WURTS' MAGNA CHARTA, pp. 158-168 inclusive, gives sixty nine Generations of lineal descent from Edward the Great, (Aedd Mawr) to Geoffrey Plantagenet. This also shows Geoffrey's descent from the FRANKISH KINGS, also his descent from (HELI) Beli the Great through LUD, through TUANTIUS, through CYNVELIN (CYMBELINE), through AVIRAGUS, through MERIC (MARIUS), through EURGEN, through GLADYS, wife (LLEUVER MAWR) LUCIUS THE GREAT. And page 168 Wurt's Magna Charta shows that both Geoffrey Plantagenet and his wife, Matilda, or Maud, of England, were descendants of WILLIAM THE CONQUEROR, and descended from CHARLEMAGNE.

Hamelin Plantagenet married Isabel de Warrenne April 1164. She was the Countess of Surrey. Both are buried at Lewes, East Sussex, England. It is said they had at least 12 children. Hamelin's son, William de Warrent Earl of Warren and Surrey is named in the Magna Charta as an adviser of King John. Most historians believe Hamelin was also an adviser to King John.
Hamelin added the unique keep at Conisbrough, in Yorkshire. Conisbrough has a cylindrical core, from which 6 enormous buttresses project like the spokes of a wheel. For more on the castle see the book "Early Medieval Architecture" By Roger Stalley, 1999, Oxford University Press. ISBN 0192842234. You can also visit the Castle's website