Select the Word or Phrase That Best Matches the Definition

Select the word or phrase that best matches the definition or example.
-A political-religious system in which the secular ruler is also head of the religious establishment,as in the Byzantine Empire.

A) Jesus Sutras
B) Nubian Christianity
C) Ethiopian Christianity
D) Byzantine Empire
E) Constantinople
F) Justinian
G) caesaropapism
H) Eastern Orthodox Christianity
I) icons
J) Kievan Rus
K) Prince Vladimir of Kiev
L) Charlemagne
M) Holy Roman Empire
N) Roman Catholic Church
O) Western Christendom
P) Cecilia Penifader
Q) Crusades