As in many such cases, captives from noble families were taken in order to guarantee good behavior on the part of the conquered. One of these was John Axouch, given to Emperor Alexios I as a present. Alexios took him to Constantinople where Axouch became a companion to Alexios' son John Comnenos (shown above; there are no available representations of John Axouch).
The two were constant companions and close friends. When Alexios died and his son became Emperor John II Comnenos, he appointed his close friend megas domestikos, essentially commander-in-chief of the army. Axouch was also given the court title of sebastos, equivalent to the Roman augustus, meaning "venerable one." Members of the imperial family were required to treat him with the greatest respect.
This generated hostility among the royal family, which Axouch wisely tried to ameliorate. When a plot against John by his sister Anna was foiled, John wanted to give Axouch all her properties, but Axouch refused, knowing how much the action would increase the enmity felt towards him by the royals. He also (we are told) persuaded John to reconcile with his sister and let her keep her property.
John liked to be personally involved in military campaigns, and the two worked well together. For example, Axouch would be sent ahead to begin a siege, and John would follow up with more of the army to swiftly conclude the taking of a city.
John died after being wounded while hunting on a campaign in Cilicia. Axouch quickly traveled back to Constantinople in order to reach it before news of the death did. The urgency was to ensure that John's younger son Manuel succeeded him, rather than the older Isaac. This may have had something to do with Isaac's reputation for being irascible, or perhaps in order to fulfill a prophecy. Some historians of the time claim that Axouch was close to Isaac, and tried to persuade John that the elder son was a better candidate. They also say Manuel was suspicious of the friendship between Axouch and Isaac.
Whatever the case, the truth is that Manuel became emperor and confirmed Axouch in his position as megas domestikos. There were troubles ahead, however, which I will tell you about tomorrow.