Title: Constantine Diogenes
Content:  Constantine Diogenes (died 1032) was a prominent Byzantine general of the early 11th century, active in the Balkans. He served with distinction in the final stages of the Byzantine conquest of Bulgaria under Emperor Basil II, and occupied high commands in the Balkans until his arrest in 1029, as the result of his participation in a conspiracy against Emperor Romanos III Argyros. Imprisoned and forced to enter a monastery, he committed suicide in 1032 during an inquest on a further conspiracy. He was the father of Emperor Romanos IV Diogenes.
Title: Constantine Diogenes II
Content: 1) REDIRECT:Constantine Diogenes (son of Romanos IV) 
Title: Constantine Diogenes
Content:  Constantine Diogenes is the first notable member of the noble Diogenes family with origins from Cappadocia, which played an important role in 11th-century Byzantium. Diogenes began his career as a commander of one of the western tagmata during the reign of Basil II (r. 976–1025), in the latter's campaigns against Bulgaria. In 1014, he participated in the decisive Byzantine victory at the Battle of Kleidion (July 29), and he subsequently succeeded Theophylact Botaneiates as commander (doux) of Thessalonica with the rank of patrikios, making him the second-most senior general of the Empire in the Balkans after David Arianites. Following the death of Tsar Samuel of Bulgaria 
Title: Constantine Diogenes
Content:  attested by another seal naming him "anthypatos, patrikios and doux of Thessalonica, Bulgaria and Serbia". Diogenes had been married to an anonymous daughter of Basil Argyros, brother of Emperor Romanos III Argyros (r. 1028–1034), but in 1029 he was accused, along with other prominent Balkan generals such as Eustathios Daphnomeles, of conspiring against the emperor with the porphyrogennete princess Theodora. He was transferred east as strategos of the Thracesian Theme but, as soon as his complicity in the affair was confirmed, was recalled to Constantinople. There he was imprisoned, beaten and publicly paraded in the Mese along with the other conspirators, and later tonsured and 
Title: Constantine Diogenes
Content:  to enter the Stoudios Monastery. Theodora herself was placed in a convent, but she apparently continued to conspire with Diogenes, who planned to take advantage of Romanos's absence on campaign in the East in 1032 to escape to the Balkans. The plot was leaked to Romanos by Theophanes, metropolitan of Thessalonica, and the conspirators were arrested. Diogenes was brought to the Palace of Blachernae for interrogation by John the Orphanotrophos, but he committed suicide, throwing himself off a wall, rather than confess under torture and implicate his fellow conspirators. Constantine's son Romanos Diogenes became a successful general and eventually rose to become emperor in 1068–71.
Title: Romanos IV Diogenes
Content:  Romanos Diogenes was the son of Constantine Diogenes and a member of a prominent and powerful Byzantine Greek family from Cappadocia, the Diogenoi, connected by birth to most of the great aristocratic nobles in Asia Minor. His mother was a daughter of Basil Argyros, brother of the emperor Romanos III. Courageous and generous, but also impetuous, Romanos rose with distinction in the army due to his military talents, and he served on the Danubian frontier. At that time some parts from the theme of Bulgaria were organized as a new province with the centre at Serdica, and he became a duke of that province in 1067. However, he was eventually convicted of attempting to usurp the throne of the sons of Constantine X Doukas in 1067. While waiting to receive his sentence from the regent Eudokia Makrembolitissa, he was summoned into her presence and advised that she had pardoned 
Title: Diogenes (Byzantine family)
Content:  Diogenes (Δι[o]γενής), feminine form Diogenissa (Διογένισσα), plural: Diogenoi, was a Cappadocian Greek noble family of the Byzantine military aristocracy that provided several prominent generals and three emperors during the 10th and 11th century. Romanos IV Diogenes was a general, who by marriage to Eudokia Makrembolitissa, was Byzantine Emperor between 1068 and 1071, most notable for the pivotal Battle of Manzikert in 1071.
Title: Constantine Diogenes (son of Romanos IV)
Content:  Constantine Diogenes (died 1073) was one of the sons of Byzantine Emperor Romanos IV Diogenes (reigned 1068–1071). He was a son of Romanos with his unnamed first wife, a daughter of Alusian, and hence excluded from the line of succession when his father married the empress-dowager Eudokia Makrembolitissa in 1068. He was named after his grandfather, general Constantine Diogenes (died 1032). The then kouropalatissa Anna Dalassene (later, regent of the empire), wife of the brother of the late Emperor Isaac I Komnenos, despised the Doukas imperial family. According to perceptions of Anna Dalassene, the Doukas men had usurped the imperial dignity by tricking emperor Isaac into resigning and her husband, the kouropalates John Komnenos, into refusing the throne. Anna Dalassene expected the Doukas men to lead the country to military problems. Consequently, Anna Dalassene plotted with Romanos 
Title: Romanos IV Diogenes
Content: Constantine Diogenes, who was married to Theodora, sister of Alexios I Komnenos. This marriage was arranged by Anna Dalassena after the death of Romanos IV, but it was short-lived, as Constantine perished under the walls of Antioch in 1073 while serving with his brother-in-law Isaac Komnenos. Leo Diogenes – born in 1069, and according to Anna Comnena was made co-emperor during his father's reign. In the reign of Alexius I, he was taken into the imperial palace and given various high commands. He died in Alexius's campaigns against the Pechenegs in 1087. ; Nikephoros Diogenes – born in 1070, made Co-emperor upon his birth. By his first wife, an unnamed daughter of Alusian of Bulgaria, Romanos IV Diogenes had at least one son: By his second wife, the Empress Eudokia Makrembolitissa, he had:
Title: Constantine Diogenes (pretender)
Content:  Pseudo-Constantine Diogenes or Pseudo-Leo Diogenes (died after 1095) was an unsuccessful pretender to the Byzantine throne against Emperor Alexios I Komnenos. Of lowly origin, he pretended to be a son of Emperor Romanos IV Diogenes. Exiled to Cherson, he escaped and took refuge among the Cumans. In 1095, he invaded the Byzantine Empire at the head of a Cuman host and advanced as far as Adrianople before being captured by a ruse and blinded by loyalist forces.

Question: Who is the father of Konstantinos Diogenes?
Answer: Romanos IV Diogenes.
Romanus IV Diogenes, Emperor of Constantinople.
Romanus IV.