Is it clear in the sentence below that Queen Eleanor supported artists, writers, and philosophers, or is it confusing, meaning one cannot tell if it was Eleanor or Henry that supported artists, writers, and philosophers? The intent is that Eleanor was the supporter. The second sentence may add to the confusion because of the word "this," which is intended to show backing that Marie was a guest of the court.
My question is the function of the comma after the word Aquitaine. The information provided by the clause starting with 'who' is required to delineate Queen Aquitaine, but in such cases, a comma is usually not required because it is extra information. I'm looking for the grammatical reason why it is required.
Marie de France appears to have been a habitual guest of the court of Henry II of England and his wife, Queen Eleanor of Aquitaine, who supported artists, writers, and philosophers in the court. Evidence of this can be traced to the dedication of Marie's lais to King Henry and her "Ysopet" to his son, William, Count of Salisbury.