However, by marrying contrary to Swedish constitutional requirements, he lost those titles, becoming instead Luxembourgish nobility as Prince Bernadotte and Count of Wisborg.

Prince Oscar, before his marriage, served in the Swedish Navy, where he was enlisted for 25 years and attained the rank of Vice Admiral.

As the only member of Swedish royalty known to be born again, he founded the Södertälje Conferences, as inspired by the Keswick Convention, in 1898 and was an engaging inter-denominational Christian lay preacher of wide repute.

They were married on 15 March 1888 in St Stephen's Church at Bournemouth in England by the vicar Gustaf Beskow, who was close to the queen, Sofia of Nassau, in the presence of Oscar's mother, Queen Sophia, two of his brothers (Prince Carl, Duke of Västergötland, and Prince Eugen, Duke of Närke), his cousin the Danish crown princess Louise of Sweden, as well as the mother and brother of Ebba.

His wife was the daughter of Carl Jacob Munck af Fulkila (1808–1882) and his spouse, Baroness Henrika Ulrika Antoinetta Carolina Cederström (1819–1912).