" 
 : The discussion in this paragraph referred to starts ""Longchamp's relations with the English people were made more difficult because he was a native of Normandy, and often insensitive to English customs."" so this isn't just John and the nobles we're referring to, it's the whole of the people, including the native clergy who would have staffed his cathedral. But I've added a bit to the sentence to make it clear that the problems with not speaking English would have been with the his flock not necessarily John or the nobles.  -  "