Name of the Dutch royal house, originally a princely dynasty of the principality centred on the town of Orange in France in the 16th century.
Members of the family held the position of stadtholder or magistrate from the mid 16th until the late 18th century. In 1689 William of Orange became King William III of Great Britain and Ireland and the son of the last stadtholder became King William I of the United Netherlands in 1815.
Orange Order a Protestant political society in Ireland, especially in Northern Ireland; members are known as Orangemen. The Orange Order was formed in 1795 (as the Association of Orangemen) for the defence of Protestantism and maintenance of Protestant ascendancy in Ireland, and was probably named from the wearing of orange badges as a symbol of adherence to William III (William of Orange), who defeated the Catholic James II at the Battle of the Boyne in 1690.