Helena Doukaina Angelina
Helena Doukaina Angelina(" Helene Doukaina Angelina") was a Greek noblewoman of Thessaly and Queen- consort of medieval Serbia.
Her parents were John I Doukas of Thessaly and his wife Hypomone( a daughter of the Thessalian Vlach chieftain Taronas).
In ca. 1273/76, Helena married Serbian king Stefan Milutin( r. 1282–1321), but Milutin abandoned her in ca.
1283.
It is possible that their sons were Kings Stefan Konstantin and Stefan Dečanski.
It seems Hele na then returned to Greece.
John Doukas (Caesar)
John Doukas( or Ducas)(" Iōannēs Doukas")( died c. 1088) was the son of Andronikos Doukas, a Paphlagonian nobleman who may have served as governor of the theme of Moesia, and the younger brother of Emperor Constantine X Doukas.
John Doukas was the paternal grandfather of Irene Doukaina, wife of Emperor Alexios I Komnenos.
Theoxena
Theoxena was the daughter of prince Herodicus, a well- respected person of Thessaly and one of their main leaders.
Michael Kaballarios
Michael Kaballarios was a Byzantine aristocrat and military leader.
In ca. 1277 he was" megas konostaulos"( commander of the Latin mercenaries).
Along with the" megas stratopedarches" John Synadenos, he led a Byzantine army against John I Doukas of Thessaly, but was defeated in the Battle of Pharsalus and died shortly afterwards of his wounds.
Michael II Komnenos Doukas
Michael II Komnenos Doukas, Latinized as Comnenus Ducas ("Mikhaēl II Komnēnos Doukas"), often called Michael Angelos in narrative sources, was from 1230 until his death in 1266/68 the ruler of the Despotate of Epirus, which included Epirus in northwestern Greece, the western part of Greek Macedonia and Thessaly, and western Greece as far south as Nafpaktos.
John I Doukas of Thessaly
John I Doukas , Latinized as Ducas, was an illegitimate son of Michael II Komnenos Doukas, Despot of Epirus in –1268.
After his father's death, he became ruler of Thessaly from to his own death in 1289.
From his father's family he is also inaccurately known as John Angelos.
Married to a Thessalian Vlach woman, John first appears leading Vlach troops alongside his father in the lead-up to the Battle of Pelagonia in 1259.
His defection to the camp of Emperor Michael VIII Palaiologos was crucial in the battle, which ended with the crushing defeat of the Epirotes' Latin allies and opened the way for the recovery of Constantinople and the re-establishment of the Byzantine Empire under Palaiologos in 1261.
John quickly returned to the side of his father and brother, Nikephoros, and assisted them in recovering Epirus and Thessaly.
After Michael II died, John Doukas became ruler of Thessaly with his seat at Neopatras, whence Western chroniclers often erroneously called him "Duke of Neopatras".
Although Michael VIII Palaiologos engaged him in a marriage alliance and awarded him with the high title of "sebastokratōr", John remained the foremost of Palaiologos' Greek opponents throughout the latter's reign.
A staunch opponent of the Union of the Churches promoted by Palaiologos for political reasons, he provided refuge to several political opponents of the emperor, and even convoked synods that anathematized Palaiologos and the supporters of the Union.
He resisted several attempts by Byzantine armies to conquer Thessaly, and allied himself with Palaiologos' Latin enemies, including the Duchy of Athens and Charles of Anjou.
He died in 1289, leaving the rule of Thessaly to his sons, Constantine and Theodore.
John II Doukas of Thessaly
John II Doukas, also Angelos Doukas( Latinized as Angelus Ducas), was ruler of Thessaly from 1303 to his death in 1318.
John II Angelos Doukas was the son of Constantine Doukas of Thessaly by his wife Anna Euagionissa.
He succeeded to his father's lands as a child in 1303.
The Thessalian magnates chose his father's cousin Duke Guy II de la Roche of Athens as regent, and the duke promptly established his protectorate over Thessaly, with Anthony le Flamenc as his deputy(" bailli").
Guy was the son of Duke William I de la Roche by Helena Komnene, the daughter of John I Doukas of Thessaly.
The selection of the duke of Athens as regent proved both timely and fortuitous.
Anna Palaiologina Kantakouzene, the regent of Epirus had invaded Thessaly, but was now forced to retreat by Guy's forces.
Guy proved less successful, however, in restraining the Catalan Company, which burst into Thessaly in 1306 and proceeded to ravage the region for some three years.
By the time Guy died in 1308 John had just come of age and resented the attempt of the new duke of Athens, Walter of Brienne, to maintain Athenian protectorate over Thessaly.
To overcome John's resistance, Walter hired the Catalan Company himself, and charged it with asserting his authority over Thessaly.
The Catalans conquered many fortresses, but insisted on garrisoning them by themselves.
Frightened by their disobedience, Walter now turned against them, but the Catalans invaded his duchy in 1310.
When the two forces clashed, Walter was defeated and killed in the Battle of Halmyros or Kephissos in 1311.
With the Catalans moving into Boeotia, Attica, and the Gulf of Corinth coast, John II was able to exert more control over Thessaly.
Here he encountered the opposition of the local magnates, who had probably become accustomed to central authority that had been even more ineffectual than usually.
John attempted to strengthen his position by drawing closer to the Byzantine Empire and marrying Irene Palaiologina, the illegitimate daughter of Emperor Andronikos II Palaiologos in 1315.
Perhaps at this time John was conferred the title of" sebastokratōr".
He was already relying on some Byzantine assistance against the Catalans within his domains, but died in 1318 without heirs.
On John II's death in 1318 much of northwestern Thessaly came under the control of the powerful magnate Stephen Gabrielopoulos, but the southernmost areas around Neopatras were seized by the Catalans, who set up their own principality there( the Duchy of Neopatras).
Anna Palaiologina Kantakouzene
Anna Palaiologina Kantakouzene( died after 1313) was the niece of the Byzantine emperor Michael VIII Palaiologos, second wife of Nikephoros I Komnenos Doukas of Epirus and regent of Epirus upon his death around 1297.
Theodore Angelos
Theodore Angelos was co-ruler of Thessaly from to his death in.
Theodore was the third son of John I Doukas, ruler of Thessaly by his wife, who is only known by her monastic name Hypomone(" Patience").
When John died in or shortly before 1289, he was succeeded by Theodore's older brother Constantine, but Theodore served as his co-ruler.
Initially, the two brothers were under the tutelage of Anna Palaiologina Kantakouzene as they were underage.
Awarded the title of" sebastokrator" from the Byzantine emperor in 1295, he was scheduled to marry the Armenian princess Theophano, but this project fell through.
He was defeated in battle by the Byzantine general Michael Doukas Glabas Tarchaneiotes, and died in.
Alexios Kaballarios
Alexios Kaballarios or Kaballares was a Byzantine aristocrat, cousin of Emperor Michael VIII Palaiologos( r. 1259–1282).
He participated in the Byzantine campaigns in the Morea in the early 1260s, and was taken prisoner by William II of Villehardouin after the Battle of Makryplagi( 1263/ 1264).
Apparently released at some later date, in ca. 1270 he held the offices of" epi tes trapezes" and governor of Thessalonica.
Along with the" despotes" John Palaiologos, he led a Byzantine army against John I Doukas of Thessaly, but was defeated and killed in the Battle of Neopatras( variously dated to 1273 – 1275).

Question: Where did John I Doukas Of Thessaly's father die?