Bardas Phokas the Elder
Bardas Phokas  (c. 878 – c. 968) was a notable Byzantine general in the first half of the 10th century, and father of Byzantine emperor Nikephoros II Phokas and the "kouropalates" Leo Phokas the Younger.
Bardas was the scion of the Phokas family, one of the great houses of the Anatolian military aristocracy, his father was Nikephoros Phokas the Elder, an eminent Byzantine general with a distinguished record of service in Italy.
In 917, he participated under the orders of his elder brother Leo in the disastrous Battle of Acheloos.
In 941, he was governor of the Theme of Armeniakon, in the area previously known as Paphlagonia.
In this year the Rus' navy under the leadership of Igor I of Kiev attacked the Empire.
Driven off from Constantinople, the Rus' landed in Bithynia and ravaged it.
Bardas kept the attackers from doing too much damage with his local militia levies until the larger Byzantine army under John Kourkouas came and drove the Rus' out.
In 945 he was appointed supreme commander of the Byzantine armies of the East by Emperor Constantine VII Porphyrogenitus.
In this command he did not make much progress against the Arab forces, being repeatedly defeated by Sayf al-Daula, emir of Aleppo.
In 953, he was defeated and severely wounded by Sayf and after further defeats, he was replaced by his son Nikephoros in 954/955.
When Nikephoros came to the throne he made his father Caesar, only a step below the imperial title.
He died about 968 at the age of 90.
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Constantine Phokas
Constantine Phokas (died 953/954) was a Byzantine aristocrat and general.
Constantine was the youngest son of Bardas Phokas the Elder, and brother of the general and later emperor Nikephoros II Phokas and the general Leo Phokas the Younger.
When his father was appointed as Domestic of the Schools (commander-in-chief of the Byzantine army) in 945, Constantine was appointed "strategos" (military governor) of the theme of Seleucia, on the Empire's southeastern border with the Muslim world.
He participated in his father's campaigns against the Muslims, and was captured by the Hamdanid Emir of Aleppo, Sayf al-Dawla, at the Battle of Marash in 953.
Constantine took part in Sayf al-Dawla's subsequent triumphal entry into Aleppo, but he soon fell ill and died (probably in early 954).
Some Byzantine sources suggest that he was poisoned by Sayf al-Dawla after refusing to convert to Islam, while Arab sources claim that he was poisoned by Byzantine agents after Sayf al-Dawla refused a huge ransom offered by Bardas Phokas.
Whatever the truth, Constantine's death seems to have been blamed on Sayf al-Dawla by the Byzantines, and many Arab captives, including some of the Hamdanid emir's relatives, were executed as a result.
Some Byzantine and Arab sources claim that this resulted in the failure of a peace embassy sent by the Byzantines in June 954 under Paul Monomachos, but modern scholars discount this.
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Question: Who is Constantine Phokas's paternal grandfather?