Origins Nothing is known for certain about the family's origin. Later tradition, mentioned by the historian
Nikephoros Bryennios, held that they descended from a paternal cousin of the
Roman emperor Constantine I who had migrated to
Constantinople in the 4th century and allegedly became the city's governor with the title of
doux. This tradition is, however, evidently an invention meant to glorify the family, at the time the Empire's ruling dynasty, by 11th-century court chroniclers. In fact, it is more likely that the surname derives from the relatively common military rank of
doux. Some authors have raised the possibility of an
Armenian descent, but all evidence suggests that the Doukai were native-born
Greeks, probably from
Paphlagonia in north-central
Anatolia, where their estates were located.
Doukai of the early 10th century chronicle. The first representative of the family appears in the mid-9th century, during the regency of Empress
Theodora (r. 842–855), when he was sent to forcibly convert the
Paulicians to Orthodoxy. He is only known as "the son of Doux", although
Skylitzes interpolates the name of Andronikos, probably in confusion with Andronikos Doukas (see next). This name is also used by some modern sources--
e.g., in the
Prosopographie der mittelbyzantinischen Zeit (Andronikos #433). The first branch of the family to achieve prominence was in the early 10th century (they are usually referred to with the archaic form
Doux rather than
Doukas in the sources), with
Andronikos Doukas and his son
Constantine Doukas. Both were senior generals during the reign of Emperor
Leo VI the Wise (r. 886–912). In circa 904, Andronikos engaged in an unsuccessful rebellion and was forced to flee to
Baghdad where he was killed circa 910. Constantine managed to escape and was restored to high office, becoming
Domestic of the Schools. He was killed, however, along with his son Gregory and nephew Michael, in an unsuccessful coup in June 913. These deaths, along with the
castration and
exile of Constantine's younger son Stephen and the death of a Nicholas Doukas (of uncertain relation to the others) at the
Battle of Katasyrtai in 917, mark the end of the first group of Doukai recorded in Byzantine sources. It is likely, as the 12th-century historian
Zonaras records, that the Doukai line died out, and that the later bearers of the name were descendants through the female line only.
Lydoi-Doukai under Basil II Towards the end of the 10th century, there appeared a second family, sometimes known as
Lydoi ("the
Lydians", likely indicating their origin). Its members were Andronikos Doux Lydos and his sons, Christopher and Bardas, the latter known by the sobriquet
Mongos ("hoarse"). It is unclear whether the
doux in Andronikos's name is a surname or a military rank; some scholars consider them as belonging to the Doukas clan, although the exact relation, if any, with the earlier Doukai is impossible to ascertain. The family was involved in the 976–979 rebellion of
Bardas Skleros against Emperor
Basil II (r. 976–1025), but the sons were later pardoned and resumed their careers. Bardas the
Mongos is attested as late as 1017, when he led a military expedition against the
Khazars.
Doukas imperial dynasty '' of Emperor Constantine X Doukas (r. 1059–1067). The third group of the family, the Doukai of the 11th century, was the more numerous and distinguished one, providing several generals and governors, and founding the Doukid dynasty which ruled Byzantium from 1059 to 1081. These Doukai seem to have come from
Paphlagonia, and were exceedingly wealthy, possessing extensive estates in
Anatolia. Again, the relationship of this group with the Doukai of the 9th and 10th centuries is unclear; the contemporary writers
Michael Psellos and
Nicholas Kallikles affirm such a relationship, but Zonaras openly questioned it. The most famous members of this group were the dynasty's founder, Emperor
Constantine X Doukas (r. 1059–1067), his brother
John Doukas,
katepano and later
Caesar, Constantine's son
Michael VII Doukas (r. 1071–1078), Michael's younger brothers,
Konstantios and
Andronikos Doukas, Michael's son and co-emperor
Constantine Doukas and John's son, the general
Andronikos Doukas. The most important connection, however, was to the
Komnenoi: in 1077,
Alexios Komnenos, then a general and later emperor (r. 1081–1118), married
Irene Doukaina, the great-niece of Constantine X; thereafter, the family name
Komnenodoukas was often used. This marriage alliance was crucial for Alexios's own rise to the purple: his marriage to a Doukaina made him senior to his elder brother Isaac, and it was Doukai financial and political support that largely facilitated the successful and bloodless coup that brought him to the throne.
Under the Komnenoi Their association with the Komnenoi helped ensure the continued prominence and prestige of the Doukas name at the apex of the Byzantine aristocracy into the
Komnenian period, and the presence of the family's members amongst the higher officials of the Byzantine state. During the reign of Alexios I, the Doukai continued to play an important role: Constantine Doukas was recognized as heir-apparent and affianced to
Anna Komnene (although he lost his title when the future
John II Komnenos was born); and Irene Doukaina's brothers, the
protostrator Michael Doukas and the
megas doux John Doukas were among the most prominent military leaders of the late 11th century. During the 12th century, the prestige of the Doukas name meant that it was often taken as a second surname by members of other families, even if remotely (and usually
matrilineally) linked to the actual Doukai, who became relatively obscure after the turn of the century. It is hence impossible to clearly distinguish the numerous holders of the name or to discern their exact relationship with the 11th-century Doukid dynasty. The actual bloodline of Constantine X died out probably before 1100, and the last known descendants of his brother, the
Caesar John, lived in the first half of the 12th century. The majority of the 12th-century bearers of the name were therefore most likely members of other families, linked through marriage with the Doukai, who chose to emphasize this relationship due to the prestige the name conferred.
Later branches In this way, mingled with other noble families or adopted
de novo even by humble families unrelated to the original lineage, the Doukas name survived into the last centuries of the Byzantine Empire. A prominent example of the Late Byzantine period were the Komnenodoukai of the
Despotate of Epirus in northwestern Greece, founded by
Michael I Komnenos Doukas and other descendants of
John Doukas, a grandson of Alexios I Komnenos and Irene Doukaina. From them the surname "Doukas" was used by the Greek, and later Serbian, rulers of Epirus and
Thessaly until the 15th century. Other examples include
John III Doukas Vatatzes,
Nicaean emperor (r. 1221–1254) and his relatives, the late Byzantine historian
Doukas, and the
megas papias Demetrios Doukas Kabasilas in the mid-14th century. The name spread far and wide across the Greek-speaking world as well as in
Albania, and remains fairly common to this day. Among the more notable bearers of the Doukas name in the post-Byzantine period were the 16th-century Cretan scholar
Demetrius Ducas, the 17th-century rulers of
Moldavia George Ducas and
Constantine Ducas (their descent is variously given as Greek,
Vlach or
Albanian) or the 19th-century scholar and educationalist
Neophytos Doukas. Several variations also developed, such as
Doukakes (Δουκάκης) (cf. former
Massachusetts state governor
Michael Dukakis),
Doukopoulos (Δουκόπουλος),
Doukatos (Δουκάτος),
Makrodoukas or
Makrydoukas (Μακροδούκας/Μακρυδούκας), etc. Other variants like
Doukaites (Δουκαΐτης) or
Doukides (Δουκίδης) seem to derive not from the surname, but from a locality and a first name "Doukas" respectively. ==Family tree of the House of Doukas==