Left: Catherine the Great's "Greek Plan". Red marks the planned borders of the restored Byzantine Empire under her grandson Konstantin Pavlovich, blue marks the planned borders of the "Kingdom of Dacia" under Grigory Potemkin. The compensations for the Habsburg monarchy are marked with yellow and the compensations for Venice are marked with blue-green.
The choice of the Holy Roman emperor Frederick I Barbarossa to march through the Byzantine Empire during the Third Crusade in 1189 caused the Byzantine emperor, Isaac II Angelos , to panic and nearly caused a full-scale war between the Byzantine Empire and Western Christianity.
雙帝問題
PHILIP I OF TARANTO
притязания императоров Востока и Запада на титул римского императора в Средневековье
Begriff aus der Geschichte von Ostrom und Westrom vor 800
Friedrich I. Barbarossa.jpg
Problema dei due imperatori
유럽에서 로마의 황제에 대한 논쟁
Greek Plan Catherine the Great.png
Problem of two emperors
Great Catherine's dream.png
Zweikaiserproblem
Right: Close-up of the intended approximate borders of the restored Byzantine Empire and the Kingdom of Dacia .
right
두 황제 문제
terme historiographique
a problem arising when multiple people claim the title of emperor
disputa entre los emperadores bizantinos y del Sacro Imperio Romano Germánico acerca de qué monarca poseía legítimamente el título de emperador romano
The Imperial Ideology
disputa tra i sovrani dell'Impero Romano d'Oriente e del Sacro Romano Impero per il legittimo titolo di imperatore romano