William the Conqueror

Born in 1028 in Normandy, King William I of England, also known as William the Conqueror, is known for his conquest of England and eventual rise to power. William had convinced himself that the crown of England was for the taking, and that he could successfully conquer England in a short period of time. As he strengthened Normandy's defenses and rallied 7,000 troops, in 1066 he finally conquered England in only a few months. As a result, William was the first Normand King of England and soon began for fortify his regime by building dozens of castles and spreading his royal army around the land. William's reign was so powerful it reshaped England as a whole during the Middle Ages. After a fatal horse riding injury when he was 59, William divided his succession between his three sons, Robert, William Rufus, and Henry. His youngest son, Henry, later became the famous King Henry I of England.

(From the Deadliest Warrior wiki)