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Their heirs became Princes of Orange in the early fifteenth century, when Jean III de Chalon-Arlay married the heiress of the Principality of Orange; the title baron of Arlay is still held by Willem-Alexander of the Netherlands.
However in practice the princes of Orange of the House of Orange-Nassau, beginning with William the Silent, were always chosen as stadtholders of most of the provinces.
Herbert H. Rowen, The princes of Orange: the stadholders in the Dutch Republic.