William I (c. 1027 – September 9, 1087), was King of England from 1066 to 1087. Known alternatively as William of Normandy, William the Conqueror and William the Bastard, he was the illegitimate and only son of Robert the Magnificent, Duke of Normandy, and Herleva, the daughter of a tanner. Born in Falaise, Normandy, now in France, William succeeded to the throne of England by right of conquest by winning the Battle of Hastings in 1066 in what has become known as the Norman Conquest.
No authentic portrait of William exists. In the patriotic print he is wearing plate armour that was invented generations after his death.
William was born the grandnephew of Queen Emma, wife of King Ethelred the Unready and later of King Canute.
William succeeded to his father's Duchy of Normandy at the young age of 7 in 1035 and was known as Duke William II of Normandy. He lost three guardians to plots to usurp his place. King Henry I of France knighted him at the age of 15. By the time he turned 19 he was himself successfully dealing with threats of rebellion and invasion. With the assistance of King Henry, William finally secured control of Normandy by defeating the rebel Norman barons at Caen in the Battle of Val-es-Dunes in 1047.
He married Matilda of Flanders in 1050 or 1051 at the Cathedral of Notre Dame at Eu, Normandy (now in Seine-Maritime). He was 23, she was 21. Their marriage produced four sons and six daughters (see list below).
His half-brothers Odo of Bayeux and Robert, Count of Mortain played significant roles in his life.