 After he had mastered medicine, he wished to study astronomy; he was informed that in order to satisfy his desire, he would have to go to Persia (then under Ilkhanate rule).He traveled to Trebizond, where he was given some assistance by the Emperor Alexios II of Trebizond, and thence proceeded to Persia itself, where he persuaded yet another Emperor to aid him.He eventually learned all that he wished to know, and returned to Trebizond, bearing away from Persia a number of astronomical texts which he translated into Greek."