two emperors or two-emperor problem (deriving from the German term Zweikaiserproblem, Greek: πρόβλημα δύο αυτοκρατόρων) is the historiographical term for...

based on the four-year old boy's baptism at Pavia in 780. German: Zweikaiserproblem, "two-emperors problem" Latin: Karolus serenissimus augustus a deo...

known in historiography as the problem of two emperors (in German, Zweikaiserproblem). According to Theophanes the Confessor, Charlemagne had attempted...

title as the supreme ruler of Islam. The problem of two emperors (Zweikaiserproblem) overlapped with the emerging Turkish threat (Turkengefahr): in 1526...