However, after the death of Anton Günther, Oldenburg fell again under Danish authority, and 1667 the town was struck by a disastrous plague epidemic and shortly thereafter was destroyed in a fire.
Kuid pärast Anton Güntheri surma langes Oldenburg taas Taani võimu alla ja 1667. aastal tabas linna laastav katkuepideemia ja varsti pärast seda hävis linn tules.