The unsuccessful Battle of Stamford Bridge is why the end of the bracket is there.
The Normans had some Viking roots, hence their violence and short-lived House of Normandy in England, but were French speakers.
All of the later kings of England are descended from William of Normandy (a.k.a. William the Bastard).
Yes, "Franglais" — Anglo-Norman
Anglo-Norman refers to the Normans who lived in England after the Norman conquest of 1066.[quote taken from Brave Search]The term also denotes the form of Anglo-French used by these Anglo-Normans. Anglo-Norman was a dialect of Old Norman used in England and parts of Great Britain and Ireland during the Anglo-Norman period.