Gascony: Meaning and History

History of the flag
Legend has it that the flag of Gascony first appeared in the time of Pope Clement III (1187-1191) to unite the Gascons during the Third Crusade.
What do the elements of the flag mean?

The cross of St Andrew, patron saint of Bordeaux and the first apostle to meet Jesus Christ.
The red refers to the Kingdom of England, which ruled the region from the XIIth to the mid XVth century.
