William III of England

William III, also widely known as William of Orange, was sovereign Prince of Orange from birth, Stadtholder of Holland, Zeeland, Utrecht, Guelders and Overijssel in the Dutch Republic from the 1670s and King of England, Ireland and Scotland from 1689 until his death. As King of Scotland, he is known as William II. He is sometimes informally known as "King Billy" in Ireland and Scotland. His victory at the Battle of the Boyne in 1690 is commemorated by unionists, who display orange colours in his honour. Popular histories usually refer to his joint reign with his wife, Queen Mary II, as that of William and Mary.