He and his wife were named with new titles as "Prince and Princess Bernadotte" as of their wedding day. It has never been determined if that was a Swedish title of nobility or another form of unofficial courtesy title (such as some later dynasty members have been given). On 2 April 1892, he and his wife were given personal noble titles as Prince and Princess Bernadotte when admitted into the nobility of Luxembourg by Oscar's uncle Adolphe, Grand Duke of Luxembourg, previously Duke of Nassau, and also then given a Luxembourgish hereditary title as Count and Countess of Wisborg. "Wisborg" was derived from Visborg, castle ruins in Oscar's former Duchy of Gotland.