Blue: The History of a Color

Both black and blue were popular during the Protestant Reformation, whose adherents generally shunned bright colors—Martin Luther himself had a deep and abiding hatred for red, the symbol of Roman decadence. Blue was the color par excellence of late Middle Ages France, but it had taken a back seat to royal white during the Bourbon era. Despite morphing into France’s color of conservative republicanism, blue’s wild and barbaric roots sustained its association with protest and rebellion.

Source: www.claremont.org