Question

which byzantine emperor was defeated at manzikert by sultan alp arslan? constantine ix alexios i john ii romanos iv

Explanation:

The Battle of Manzikert in 1071 saw Byzantine Emperor Romanos IV Diogenes defeated by Sultan Alp Arslan of the Seljuk Empire. The other options (Constantine IX, Alexios I, John II) were not the emperor defeated at Manzikert.

Answer:

D. Romanos IV