 However, in early 268 he was challenged by Laelianus, probably one of his commanders, who was declared emperor at Mogontiacum (Mainz) by his Legio XXII Primigenia.Postumus quickly retook Mogontiacum and Laelianus was killed.Postumus himself, however, was overthrown and killed by his own troops, reportedly because he did not allow them to sack the city.