In the movie Braveheart William Wallace supposedly impregnates the then princess of England Was this fictional?

Yes, the portrayal of William Wallace impregnating the princess of England in the movie "Braveheart" is fictional. In reality, there is no historical evidence to support the idea that Wallace had a romantic relationship with Princess Isabella, who was only a child at the time of Wallace's rebellion. The film takes significant liberties with historical facts for dramatic effect.