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.
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.
right
притязания императоров Востока и Запада на титул римского императора в Средневековье
Begriff aus der Geschichte von Ostrom und Westrom vor 800
Problema dei due imperatori
두 황제 문제
Great Catherine's dream.png
terme historiographique
Greek Plan Catherine the Great.png
a problem arising when multiple people claim the title of emperor
Friedrich I. Barbarossa.jpg
disputa tra i sovrani dell'Impero Romano d'Oriente e del Sacro Romano Impero per il legittimo titolo di imperatore romano
disputa entre los emperadores bizantinos y del Sacro Imperio Romano Germánico acerca de qué monarca poseía legítimamente el título de emperador romano
雙帝問題
The Imperial Ideology
유럽에서 로마의 황제에 대한 논쟁
Problem of two emperors
PHILIP I OF TARANTO
Zweikaiserproblem
Right: Close-up of the intended approximate borders of the restored Byzantine Empire and the Kingdom of Dacia .