The Danubian cities (including Dristra/Dorostolon) were infiltrated by Pechenegs & revolted

Following the suspension of payments to the multicultural cities of the Danube from Constantinople suggested by Nikephoritzes, the inhabitants of Dristra defected to the Pechenegs; they entrusted the control of their city's acropolis to the Pecheneg leader Tatous 
1074 (Uncertain) 
Nikephoritzes (Nikephoros 63)
  • Suggested the suspension of annual payments from the imperial treasury to the cities of the Istros (Danube), causing their defection and their rapprochement with the Pechenegs (:) τὰς ἐκ τῶν βασιλικῶν ταμείων ἀποστελλομένας ἐτησίως φιλοτομίας σπουδῇ τοῦ Νικηφόρου περιεκόπτοντο Attaleiates: History 205.2-5 / 150.22-25
Tatous/Tatrys, Pecheneg leader at Dristra (Tatous 101)
  • Was entrusted by the inhabitants of Dristra, who had defected to the Pechenegs, with control of the acropolis (:) τὴν ἐξουσίαν τῆς ἄκρας ὁλοσχερῶς ἀναφέροντας Attaleiates: History 205.15-17 / 151.8-9