John Kontostephanos (son of Stephen)
John Komnenos Kontostephanos( ca. 1128 – 1176/82) was a Byzantine aristocrat who served as provincial governor and military commander under his uncle, Emperor Manuel I Komnenos.
Theodore Komnenos Doukas
Theodore Komnenos Doukas ("Theodōros Komnēnos Doukas",
Latinized as Theodore Comnenus Ducas, died 1253) was ruler of Epirus and Thessaly from 1215 to 1230 and of Thessalonica and most of Macedonia and western Thrace from 1224 to 1230.
He was also the power behind the rule of his sons John and Demetrios over Thessalonica in 1237–1246.
Theodore was the scion of a distinguished Byzantine aristocratic family related to the imperial Komnenos, Doukas, and Angelos dynasties.
Nevertheless, nothing is known about Theodore's life before the conquest of Constantinople and dissolution of the Byzantine Empire by the Fourth Crusade in 1204.
Following the fall of Constantinople, he served Theodore I Laskaris, founder of the Empire of Nicaea, for a few years before being called to Epirus, where his bastard half-brother Michael I Komnenos Doukas had founded an independent principality.
When Michael died in 1215, Theodore sidelined his brother's underage and illegitimate son Michael II and assumed the governance of the Epirote state.
Theodore continued his brother's policy of territorial expansion.
Allied with Serbia, he expanded into Macedonia, threatening the Latin Kingdom of Thessalonica.
The capture of the Latin Emperor Peter II of Courtenay in 1217 opened the way to the gradual envelopment of Thessalonica, culminating in the city's fall in 1224.
As ruler of Thessalonica, Theodore quickly declared himself emperor, challenging the Nicaean emperor John III Doukas Vatatzes's claims to the Byzantine imperial throne.
In 1225, he advanced to the outskirts of Constantinople, but his final attack against the seat of the much-reduced Latin Empire was delayed until 1230.
In that year, Theodore amassed an army to besiege Constantinople, but then diverted it against Bulgaria, an ambivalent ally which threatened his northern flank.
Theodore was defeated and captured at the Battle of Klokotnitsa, and spent the next seven years in captivity.
In the meantime, he was succeeded by his brother Manuel.
Manuel quickly lost Thrace, most of Macedonia, and Albania to the Bulgarian Tsar John II Asen.
Thessalonica itself became a Bulgarian vassal, while in Epirus proper power was seized by Michael II, returning from exile.
Theodore was released in 1237 when his daughter Irene married John Asen, and quickly managed to regain control of Thessalonica, ousting Manuel.
Having been blinded during his captivity and thus disqualified from occupying the throne again, he installed his eldest son John as emperor, but remained the "de facto" regent of the state.
Manuel tried to regain Thessalonica with Nicaean support, but a negotiated settlement was reached which gave him Thessaly and left Thessalonica and its environs to Theodore and John.
In 1241, John III Vatatzes invited Theodore to visit Nicaea.
He was welcomed and treated with great honour, but was effectively detained there until the spring of next year, when Vatatzes marched on Thessalonica with Theodore in tow.
Theodore was sent in to negotiate with his son and convince him to accept demotion to the rank of Despot and to recognize the suzerainty of Nicaea.
John died in 1244 and was succeeded by Theodore's younger son Demetrios.
In 1246, Vatatzes overthrew the unpopular Demetrios and annexed Thessalonica.
Theodore influenced his nephew Michael II to launch an attack on Thessalonica in 1251, but in 1252, Vatatzes campaigned against them and forced Michael to come to terms.
Theodore was taken prisoner and sent into exile in Nicaea, where he died around 1253.
John Komnenos Vatatzes
John Komnenos Vatatzes,(" Iōannēs Komnēnos Vatatzēs"), or simply John Komnenos or John Vatatzes( the transliteration' Batatzes' is also employed) in the sources, was a major military and political figure in the Byzantine( Eastern Roman) Empire during the reigns of Manuel I Komnenos and Alexios II Komnenos.
He was born c. 1132, and died of natural causes during a rebellion he raised against Andronikos I Komnenos in 1182.
John Plytos
John Plytos was a senior official and provincial governor of the Despotate of Epirus and the Empire of Thessalonica under Theodore Komnenos Doukas.
The" sebastos" John Plytos served as governor(" doux") of Krujë( where his friend, Gregory Kamonas, had ruled in), of Ohrid, and of Veroia.
He was later raised to the rank of" panhypersebastos" and appointed as" mesazon"( chief minister) of Theodore Komnenos Doukas.
Maria Petraliphaina
Maria Doukaina Komnene Petraliphaina  was the wife of Theodore Komnenos Doukas, ruler of Epirus and in 1224–1230 self-proclaimed Emperor of Thessalonica.
She is the earliest consort of the Epirote state known by name: the two wives of Michael I Komnenos Doukas, predecessor of her husband, were members of the Melissenos family but their first names are unknown.
John Komnenos (governor of Dyrrhachium)
John Komnenos was a Byzantine aristocrat, the nephew of Emperor Alexios I Komnenos and long- time governor(" doux") of the strategically important city and theme of Dyrrhachium.
John Komnenos (parakoimomenos)
John Komnenos( – after 1118) was a Byzantine aristocrat and official.
John Raoul Petraliphas
John Komnenos Raoul Doukas Angelos Petraliphas (died) was a Byzantine noble and military commander during the reign of Emperor Michael VIII Palaiologos .
John Komnenos Doukas
John Komnenos Doukas ("Iōannēs Komnēnos Doúkas"), Latinized as Comnenus Ducas, was ruler of Thessalonica from 1237 until his death in 1244.
John was the eldest son of Theodore Komnenos Doukas and Maria Petraliphaina.
In 1230 his father was captured together with his family in the Battle of Klokotnitsa by Ivan Asen II of Bulgaria.
When his sister Irene married Ivan Asen II in 1237, John was released from captivity together with his now blind father Theodore and his younger brother Demetrios.
Theodore and his sons made their way back to Thessalonica and incited a revolt against Theodore's brother Manuel Komnenos Doukas who had ruled the city since 1230.
Since Theodore was blind, he installed his son John as ruler and retired to Vodena.
In 1239, the deposed Manuel returned with Nicaean help and made himself master of Thessaly.
Unable to dislodge him, Theodore and John came to terms with the loss of that province.
In 1241 Ivan Asen II died, removing both his suzerainty and his protection from Thessalonica.
Now, if not earlier, John began using the imperial title once used by his father.
This and his exposed position attracted the attention of Emperor John III Doukas Vatatzes of Nicaea.
The Nicaean emperor invited Theodore to a conference and had him arrested, and in 1242 led his army against Thessalonica.
Upon reaching Thessalonica, he sent Theodore to negotiate with his son and obtain his submission.
John was easily induced to content himself with the title of despotes and to recognize the suzerainty of Nicaea.
Securing these concessions, John III Doukas Vatatzes rapidly returned to Asia Minor to combat the invading Seljuk Turks.
John had exhibited little talent for governing
and he is said to have desired to become a priest.
He died in 1244 and was succeeded by his younger brother Demetrios.
John II Orsini
John II Orsini, also John Komnenos Doukas or Comnenus Ducas( Greek: Ἰωάννη ς Κομνηνό ς Δούκας," Iōannēs Komnēnos Doukas", Italian: Giovanni II Orsini), was count palatine of Cephalonia from 1323 to 1324 and Despot of Epirus from 1323 to 1335.

Question: Which country John Komnenos Doukas's father is from?
Answer: Byzantine