The Greek historians also allege that Sviatoslav agreed to support Kalokyros in his ambition of gaining the imperial throne, while Kalokyros promised to reward Sviatoslav with "great, incalculable treasures from the imperial coffers" and to acknowledge his conquest of Bulgaria.
According to the Greek historians, Sviatoslav pledged his support for Kalokyros's bid for the imperial throne, while Kalokyros promised him immense wealth from the imperial coffers and recognition of his victory over Bulgaria.