question: Where was the father of John I Of Trebizond born?
context: Title: John I of Trebizond
  Passage: John I Axouchos(" Iōannēs I Axoukhos") was Emperor of Trebizond from 1235 to 1238. One editor reads the text of the chronicle of Michael Panaretos as stating that John ruled six years; although William Miller follows Fallmerayer in assuming this was a mistake for three years, another possible solution is that John was co-ruler with his predecessor Andronikos I Gidos for three years then ruled alone for three more. He was the eldest son of Alexios I of Trebizond and a woman the primary sources do not identify; some writers have named her Theodora Axuchina. Miller suggests that he was perhaps a minor at the time of his father's death in 1222, for his father was succeeded by the throne passed to Alexis' son -in- law, Andronikos I Gidos. During the Siege of Sinope, one of the sources states that Alexios has" grown sons in Trebizond who are capable of governing", so it is clear John was born before 1214. Little is recorded of John's reign, except that John died while playing tzykanion, a variant of polo fashionable among the Byzantine nobility, when he fell from his horse and was trampled to death. His heir apparent was one Ioannikios, who was confined to a monastery and John's second brother Manuel I ascended the throne. Since Fallmerayer, most historians have assume that Ioannikios was John Axouchos' son, but Panaretos'" Chronicle" does not state how Ioannikios was related to John Axouchos. Rustam Shukurov has argued that Ioannikios was the brother of both John and Manuel. Older authorities credited John Axouchos with issuing the first silver coins, or aspers of the Empire of Trebizond, but more recent authorities believe these coins better fit with the aspers struck during John II Megas Komnenos on numismatic grounds.
  Title: Alexios I of Trebizond
  Passage: Alexios I Megas Komnenos or Alexius I Megas Comnenus( c. 1182 – 1 February 1222) was, with his brother David, the founder of the Empire of Trebizond, which he ruled from 1204 until his death in 1222. The two brothers were the only male descendants of the Byzantine Emperor Andronikos I, who had been dethroned and killed in 1185, and thus claimed to represent the legitimate government of the Empire following the conquest of Constantinople by the Fourth Crusade in 1204. Although his rivals governing the Nicaean Empire succeeded in becoming the de facto successors, and rendered his dynastic claims to the imperial throne moot, Alexios' descendants continued to emphasize both their heritage and connection to the Komnenian dynasty by referring to themselves as Megas Komnenos or Grand Komnenos. While his brother David conquered a number of Byzantine provinces in northwestern Anatolia, Alexios defended his capital Trebizond from an unsuccessful siege by the Seljuk Turks around the year 1205. Further details of his reign are sparse. Muslim chroniclers record how, in 1214, Alexios was captured by the Turks in the field while defending Sinope; despite sending an envoy to seek their surrender the city refused to capitulate to Sultan Kaykaus I, and Alexios was tortured in sight of the Sinopians. The city submitted to Kaykaus and Alexios was freed after becoming Kaykaus' vassal. Alexios died at the age of forty.
answer: Constantinople
citations: John I of Trebizond Alexios I of Trebizond