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In 1079, Robert Curthose (also know as Robert II of Normandy) was in revolt against his father William I of England, better known as William the Conqueror. William had besieged his son at the castle of Gerberoy for several weeks, after which Robert and his forces sortied out of the castle. A battle ensued during which William was unhorsed, and set upon by his own son, who wounded him in the arm. According to the Anglo-Saxon Chronicle, Robert then recognized his father by his voice, and then let him ride off to safety on his own horse. See David, 1920, p.27.
What if Robert either had not recognized his father, or decided to finish him anyway? Robert never held power in England, as his ambitions were repeatedly thwarted by both is father and younger brothers William (II) Rufus and Henry (I), both of whom inherited the throne of England ahead of their elder brother. Would Robert have been able hold power in England, or would his ascension in rebellion caused a breakdown in order akin to the Anarchy?