Romanos IV Diogenes (Greek: Ρωμανός Διογένης) was a Byzantine general and Akritai commander who, after his marriage to the widowed empress Eudokia Makrembolitissa, was crowned Byzantine Emperor. He reigned from 1068 to 1071, during which time he was determined to halt the decline of the Byzantine military and to stop Turkish incursions into the Byzantine Empire. In 1071 he was captured and his army routed at the Battle of Manzikert by the forces of Alp Arslan. Having been betrayed by members of the Doukas family, while still captive he was overthrown in a palace coup, and when released he was ultimately defeated and detained. In 1072, he was blinded and sent to a monastery, where he died of his wounds. Accession to the throne 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 in Syria and 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 him and that she had furthermore chosen him to be her husband and the guardian of her sons as emperor. She took this course of action primarily due to her concern that unless she managed to find a powerful husband, she could easily lose the regency to any unscrupulous noble, and also because she was infatuated with the popular Romanos. Her decision was met with little protest as the Seljuk Turks had overrun much of Cappadocia and had even taken the important city of Caesarea, meaning that the army needed to be placed under the command of an able and energetic general. After a written oath promising never to remarry, extracted from Eudokia by Constantine X, had been set aside by the Patriarch of