It's Geoffrey again - and this time I definitely like the picture and it looks like him.
My first attempt is here: [link]Geoffrey II
, Duke of Brittany and Earl of Richmond (23 September 1158 19 August 1186) was Duke of Brittany between 1181 and 1186, through his marriage with the heiress Constance. Geoffrey was the fourth son of King Henry II of England and Eleanor, Duchess of Aquitaine it says. I always think that he was older than Richard, though.
He was brother to William, Count of Poitiers (who died as a baby), Henry the Young King, Matilda, Duchess of Saxony, Richard I of England, Leonora of Aquitaine, Joan of England and John I. of England.
Geoffrey was a good friend of Philip Augustus of France, and the two statesmen were frequently in alliance against King Henry it says. Geoffrey spent much time at Philip's court in Paris, and Philip made him his seneschal.
Geoffrey died on 19 August 1186, at the age of twenty-eight, in Paris. There are two versions of his death. The more common first version, is that he was trampled to death in a jousting tournament. At his funeral, a grief-stricken Philip was said to have attempted jumping into the coffin. Roger of Hoveden's chronicle is the source of this version; the detail of Philip's hysterical grief is from Gerald of Wales.