Jaromar was born around 1267 as a son of Prince Vitslav II of Rügen.
Under their influence Jaromar, whose sister was Margaret, wife of Duke Bogislav IV, was elected as Hermann's successor in 1289 by the cathedral chapter of Cammin.
In a bull by Pope Nicholas IV of 7 October 1289 he was confirmed as the chosen bishop.
In spite of his close ties to the Pomeranian princes, Jaromar had the estates of the bishopric confirmed by the Margrave of Brandenburg.
The man elected as his successor by the chapter, cathedral curator (Domkustos) Vitslav, was not confirmed by the Pope.