 In the later 2nd century AD, Marcus Aurelius fought them in the Marcomannic Wars, for which our source is an abridgement of lost books of Dio Cassius' history.The troubles began in late 166 when the Langobardi (the Lombards) and Obii (otherwise unknown, but possibly the Ubii) crossed the Danube into Roman Moesia.They must have done so with the consent of the Quadi, through whose territory they had to cross.