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roman-emperors.org
De Imperatoribus Romanis[3]. Retrieved 2007-11-08. "In the year 88, the Romans resumed the offensive. The Roman troops were now led by the general Tettius Julianus. The battle took place again at Tapae but this time the Romans defeated the Dacians. For fear of falling into a trap, Iulianus abandoned his plans of conquering Sarmizegetuza and, at the same time, Decebalus asked for peace. At first, Domitian refused this request, but after he was defeated in a war in Pannonia against the Marcomanni (a Germanic tribe), the emperor was obliged to accept the peace."
De Imperatoribus Romanis[4]. Retrieved 2007-11-08.