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- John IV Megas Komnenos, (c. 1403 – 1459) was Emperor of Trebizond from 1429 to 1459. He was a son of Emperor Alexios IV of Trebizond and Theodora Kantakouzene. John had been designated despotes by his father as early as 1417, but did not see eye-to-eye with his parents. In 1426 he murdered a courtier for allegedly having an affair with the Empress Theodora, and then proceeded to attack his parents. His attempt on them was overcome by the palace staff, and John was forced to flee to Georgia. In Georgia John married Bagrationi, a daughter of King Alexander I but could not obtain sufficient support to establish himself in Trebizond. In 1427 he sailed off to the Genoese colony of Caffa in the Crimea. Here he managed to charter a large galley and its crew, with which he returned to Trebizond in 1429. Although his father Alexios IV marched out against him, John managed to win the support of some of the nobility, who allowed John's agents to murder his father while he was sleeping in his tent. John's brother Alexander, who had succeeded him as despotes proved no match for the invader and fled, and by late October 1429 John IV was recognized as emperor in Trebizond some time before October 28, 1429. John IV began his reign by punishing the physical murderers of his father and burying him in state in the Metropolitan church. His reign was dominated by ongoing attempts to defend Trebizond from its Turkmen neighbors and the increasingly aggressive Ottoman Empire to the west. The first challenge was posed by the ruler of Ardabil, Junayd, who defeated the emperor and briefly besieged Trebizond before giving up and raising the siege. In 1442 the Ottoman Sultan Murad II sent out a fleet to plunder the shores and to attempt to capture the city. This expedition did not seriously impact Trebizond itself, but attacked Trebizond's dependencies in the Crimea and was partly destroyed by a storm on its return journey. The Ottomans did not make another attack on the Empire of Trebizond until the reign of the next Sultan, Mehmed II. In 1451 the Byzantine diplomat Sphrantzes arrived in Trebizond to arrange a marriage alliance between Emperor Constantine XI Palaiologos and a princess from either John IV's family or that of the kings of Georgia. This incident is notable in Sphrantzes's Chronicle for the color it paints of the emperor, since Sphrantzes arrived in Trebizond having not heard yet of the death of the Ottoman sultan Murad II, which John gleefully related. He told Sphrantzes how great it was that now his empire could last longer and be blessed because of the youth of Mehmed II. Sphrantzes, however, was taken aback and explained to him that Mehmed's youth and seeming friendship to the new emperor Constantine XI were only ploys, and that under John's brother-in-law John VIII the empire had been deeply in debt, but now his new emperor was trying to change that. The incident as described should well have served to John IV the new peril which had come forth. In 1453, after the Fall of Constantinople to Mehmed II, Trebizond and the Morea were left as the last remnants of the Byzantine imperial tradition. Mehmed II immediately summoned John to pay tribute in Constantinople and imposed heavy tolls on Trapezuntine and Venetian shipping through the straits. John apparently failed to cooperate, and in 1456 the Sultan dispatched his governor of Amasya to attack Trebizond by both land and sea. The fall of his capital seeming imminent, John at long last made his submission and agreed to pay an annual tribute of 2,000 gold pieces. He sent his brother David to ratify the treaty before Mehmed II himself, which he did in 1458, but the tribute was raised to 3,000 gold pieces. Aware of the Ottoman advance against the remaining Byzantine possessions in Greece, John attempted to bolster his position by resorting to marital alliances with neighboring princes. So he married off one of his daughters to Uzun Hasan of the Ak Koyunlu, and another daughter (or perhaps sister) to the Italian lord of Syros, Niccolò Crispo. In the increasingly desperate situation of Trebizond, John IV came to favor the idea of obtaining Western support by effecting a union with the Roman Catholic Church. As early as 1434 he responded to the letters of Pope Eugenius IV (in marked contrast to earlier emperors of Trebizond, who had ignored papal missives). In the late 1430s the Metropolitan of Trebizond joined the Byzantine clergy at the Council of Basel-Ferrara-Florence. However, these approaches to the Papacy were not marked by harmonious relations with the most important Western power concerned with Trebizond, the Republic of Genoa. Although John owed his throne to a Genoese crew, he repeatedly failed to reimburse the Genoese for debts owed to them in 1431, and in 1441 refused to provide reparations for having ordered the seizure and pillage of a Genoese ship in 1435. Further diplomatic initiatives by Genoa failed in 1443, and in 1447 the Genoese of Caffa advanced on Trebizond with their fleet, threatening to set up an embargo. The disputes were never fully settled and seriously injured commerce in the Black Sea. John's hostile attitude towards Genoa is credited to his fear of a potential Byzantino-Genoese alliance against him that could place his brother Alexander on the throne of Trebizond. Alexander had fled Trebizond for the Byzantine court in 1429 and had eventually married Maria Gattilusio, the daughter of the Genoese lord of Lesbos. The apprehensiveness towards Genoa was contrasted by friendlier relations with Venice, although the Venetians never recovered their former influence in the Black Sea. John died some time before April 22, 1459, when his brother David is first attested as emperor of Trebizond. John IV was married twice, first to an unnamed daughter of King Alexander I of Georgia, and then to an unnamed Turkish princess. Probably by his first marriage he had a son and at least one, or possibly two daughters: Alexios (1455–1463), beheaded at Constantinople Theodora, who married Uzun Hasan of Ak Koyunlu Eudokia (Valenza), who married Niccolò Crispo, lord of Syros; but she may have been a sister of John IV.
- Johannes IV. Komnenos war von 1429 bis zu seinem Tode im Jahre 1459 Kaiser und Großkomnene von Trapezunt.
- ヨハネス4世（Ιωάννης Δ', Iōannēs IV, ? - 1458年）は、トレビゾンド帝国の皇帝（在位：1429年 - 1458年）。アレクシオス4世の子。 この頃になるとオスマン朝の勢力が台頭し、トレビゾンド帝国はなすすべもない状況に追い込まれていた。1442年にはオスマン朝のスルタン・ムラト2世の侵攻を受けて帝国領は略奪を受ける有様であった。 このため、ヨハネス4世はオスマン朝に対抗するため、サファービー教団長のジュネイドやローマ教皇・カリストゥス3世、イスファンディヤル公国やカラマン君侯国のイブラヒム・ベイと同盟を結び、さらに白羊朝の第2代皇帝ウズン・ハサンと婚姻関係を結んで、オスマン朝と対抗した。このため、オスマン朝もヨハネス4世存命中はトレビゾンド帝国においそれと攻撃することが難しくなってしまったのである。 1458年死去。死後、オスマン朝の反撃が始まった。 ちなみに彼の孫娘はサファヴィー家に嫁ぎ、彼の曾孫はサファヴィー朝の初代皇帝となったイスマーイール1世にまでつながっている。
- Jan IV Dobry, gr. Ιωάννης Δ΄ Μέγας Κομνηνός - Iōannēs IV Megas Komnēnos, łac. Ioannes Kaloioannes - cesarz Trapezuntu w latach 1429-1459. Syn cesarza Aleksego IV i Teodory Kantakuzeny. Starszy brat Dawida II. W 1417 Jan został mianowany despotą przez swojego ojca, ale odbyło się to bez bezpośredniego spotkania obu stron. W 1426 Jan zamordował jednego z dworzan, którego podejrzewał o romans z cesarzową Teodorą, a następnie chciał zaatakować swoich rodziców. Jego próba została udaremniona przez innych dworzan, a Jan został zmuszony do wyjazdu do Gruzji. W Gruzji, Jan ożenił się córką króla. W 1427 wspierany przez gruzińskie oddziały, Jan wypłynął z kolonii genueńskiej - Kaffy, na Krymie, a w 1429 dotarł do Trapezuntu. Jego ojciec zebrał swoje wojsko i ruszył przeciw synowi, ale Janowi udało się pozyskać sympatię kilku wpływowych szlachciców. Cesarz Aleksy IV ostatecznie został zamordowany przez agentów syna w swoim własnym namiocie podczas snu. W październiku 1429 Jan został oficjalnie koronowany na nowego cesarza Trapezuntu.
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