Who was the wife of the prince who was the victor of the battle that is celebrated in part by a series of parades known as "Orange walks"?
Orange walk:  These typically build up to 12 July celebrations which mark Prince William of Orange's victory over King James II at the Battle of the Boyne in 1690. Battle of the Boyne: The Battle of the Boyne (Irish: "Cath na Bóinne" ] ) was a battle in 1690 between the forces of the deposed King James II of England, and those of Dutch Prince William of Orange who, with his wife Mary II (his cousin and James's daughter), had acceded to the Crowns of England and Scotland in 1688.
Mary II