Byzantine Empire depicting the Virgin Mary (left) and
Isaac II Angelos (right), first ruler of the imperial Angelid dynasty, crowned by saint Michael the Archangel. Constantine's third son
Andronikos Doukas Angelos, was the progenitor of the imperial Angelos dynasty. The Angeloi came into conflict with Emperor
Andronikos I Komnenos who had initiated a series of anti-aristocratic policies. In a 1185 coup d'état, Andronikos' son
Isaac II Angelos gained popular support and deposed Andronikos I Komnenos proclaiming himself Byzantine emperor. The new emperor did not manage to regulate the weaknesses that he inherited, including the abuses in central and provincial administration. Isaac II failed to crush the revolt of the Bulgarians and Walachians and in 1187 he was forced to recognize the
Bulgarian empire. Despite those military defeats, Isaac succeeded in retrieving imperial fortunes in the Balkans, after
Branas' victory against the
Normans at the
Battle of Demetritzes in 1185 and the victory against
Stephan Nemanja of
Serbia in 1190. During Isaac's reign, attempts to usurp imperial power by Byzantine nobles, previously uncommon in the Byzantine history of the 12th century, became a common occurrence preventing the empire's complete recovery. In 1195 Isaac II was deposed by his brother
Alexios III Angelos, whose coup and misuse of power accelerated the decline of the empire's strength. His reign was marked by abuses in provincial administration and an increasing autonomy of regional magnates who would even defy the emperor's authority. In 1201 Isaac's son,
Alexios IV Angelos, made his way to the west, where he succeeded in bringing about the diversion of the Fourth Crusade to Constantinople in order to restore his father, Isaac II, to power. Despite their initial synergy, the inability of the Angeloi to deal with the Crusaders' demands caused friction between the Crusaders and the co-emperors, who in January 1204 were deposed by
Alexios V Doukas and killed shortly after. With their former supporters now dead, the Crusaders had no support in Constantinople, while the anti-Latin sentiment of the citizens was reinforced. Following the brief reign and failed negotiations by Alexios V, the Crusaders
sacked Constantinople and established the
Latin Empire officially terminating the Byzantine rule for nearly half a century.
Komnenodoukas dynasty , one the three Byzantine rump states that emerged in 1205 and laid claim to the Byzantine throne, ruled by the
Komnenodoukas branch of the Angelos dynasty. The Angelos line was continued by the descendants of Constantine's eldest son, the
sebastokrator John Doukas. Like John, most of his descendants eschewed the surname "Angelos" and used either "Doukas" or "Komnenos Doukas", after which they are known in modern scholarship as the "Komnenodoukai" (). After the fall of Constantinople and the establishment of the
Latin Empire in 1204, John Doukas' illegitimate son,
Michael I Komnenos Doukas, founded the
Despotate of Epirus in 1205 choosing the city of
Arta as its capital. Initially a vassal and an ally of the Latins, Michael I went on to expand his territories in north-eastern Greece until his death in 1215, when he was succeeded by his half-brother
Theodore Komnenos Doukas. In 1224, Theodore captured the
Kingdom of Thessalonica from the crusaders and proclaimed himself as the legitimate Byzantine emperor (
basileus) in
his holdings. Epirus appeared as a serious contender for the Byzantine throne, but Theodore was defeated and captured by
John II Asen at the
Battle of Klokotnitsa in 1230 and his empire quickly declined following the loses in Macedonia and Thrace. During Theodore's captivity, his brother
Manuel ruled over Thessalonica, succeeded by Theodore's sons
John and
Demetrios. In 1242 the
Nicaean emperor John III Doukas Vatatzes compelled John to abandon the imperial title (keeping only the title of
despotes), and by 1246 Thessalonica was captured by Nicaea, marking the end of the Angelid rule in much of northern Greece. In 1230, Theodore's nephew
Michael II, son of Michael I, established himself as ruler of Epirus and
Thessaly and was partially successful in recapturing holdings lost to Nicaea. After the death of Michael II in 1268, Epirus was ruled by his legitimate son
Nikephoros I, while Thessalynow separated from Epiruswas given to his illegitimate son
John I Doukas. The Komnenodoukas family lost both Epirus and Thessaly in 1318;
Nicholas Orsini,
Count of Cephalonia, murdered Nikephoros' son
Thomas I, ending the rule of the family in Epirus, while in Thessaly John I Doukas was succeeded by his son
Constantine, followed by
John II, who ruled from 1302/03 until his death in 1318. In the same year, the south of Thessaly was seized by the
Catalan Grand Company and annexed to the
Duchy of Athens, while the north passed to a series of autonomous magnates. == Later family ==