princess of orange is the title ("name") used for the women who were married to the ruling princes of orange in the time between 1171 to 1815. since 1815, it was also used for the wives of the heirs to the dutch throne, who were titled prince of orange. the only woman who became a "princess of orange" without being married to a "prince of orange" was marie, princess of orange (1393-1417). together with her husband john, prince of orange (1393-1418), they governed the land.