William Marshal, 1st Earl of Pembroke

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William Marshal, 1st Earl of Pembroke (1146 or 1147 – 14 May 1219), also called William the Marshal (Norman French: Williame li Mareschal, French: Guillaume le Maréchal), was an Anglo-Norman soldier and statesman during High Medieval England who served five English kingsHenry II and his son and co-ruler Young Henry, Richard I, John, and Henry III—as a royal adviser and agent and as a warrior of outstanding prowess.

Sir William Marshal (c. 1146–1219) was an Anglo-Norman soldier and statesman widely celebrated as the greatest knight of the Middle Ages.
  
Life and Career
    Early Hostage: Born during the civil war known as The Anarchy, he was held hostage as a young child by King Stephen, who famously spared his life after being charmed by the boy. 
    Tournament Champion: He rose from a minor noble with few prospects to an undefeated tournament champion, earning immense renown, wealth, and martial skill across Europe. 
    Royal Service: He served five English monarchs—Henry II, Henry the Young King, Richard the Lionheart, King John, and Henry III—over more than five decades.
    Regent of England: Late in life, he saved the English crown from a French invasion and served as protector and regent for the young King Henry III.
Legacy
    The Greatest Knight: Upon his death in 1219, Archbishop Stephen Langton eulogized him as "the best knight that ever lived".
Biography: His life is exceptionally well-documented because his son commissioned L'Histoire de Guillaume le Mareschal, one of the earliest secular biographies of a medieval knight.