Question: What nationality is Leo Diogenes's father?
Sentence (from "Romanos IV Diogenes"): Romanos IV Diogenes ("Rōmanós IV Diogénēs"), also known as Romanus IV, was a member of the Byzantine military aristocracy who, after his marriage to the widowed empress Eudokia Makrembolitissa, was crowned Byzantine emperor and reigned from 1068 to 1071.
Relevant evidence: Yes