William III was King of the Netherlands and Grand Duke of Luxembourg from 1849 until his death in 1890. He was also the Duke of Limburg from 1849 until the abolition of the duchy in 1866.
King William II and his family (1832) by Jan Baptist van der Hulst with William III on the far left
William III depicted on a 20 gulden proof gold coin (1850)
Prince of Orange is a title associated with the sovereign Principality of Orange, in what is now southern France and subsequently held by the stadtholders of, and then the heirs apparent of, the Netherlands.