Constantine is first mentioned in the sources as a servant or follower—some modern researchers have called him a slave, but this is unlikely—of the and Basil, of whom nothing is known. He then entered the service of the powerful imperial chamberlain,
Samonas. The latter was a eunuch Arab prisoner of war who became a favourite of Emperor
Leo VI the Wise (), rising to the rank of , the highest court rank open to a eunuch, and the position of . By 907 Samonas had been awarded the supreme court post of . d at the Monastery of St. Tarasios at Samonas' orders. Miniature from the
Madrid Skylitzes In the same year, in a bid to ingratiate himself with Leo's fourth wife,
Zoe Karbonopsina, Samonas presented her with Constantine as a gift. The imperial couple took an immediate liking to Constantine, so much that Samonas began to fear for his own influence and position. As a result, he tried to slander Constantine, claiming that he was having an affair with the empress. Leo initially believed the accusations, and had Constantine banished to the Monastery of St. Tarasios. Samonas himself performed Constantine's
tonsure. Soon, however, Leo began to miss his new favourite. He had him moved to Samonas' own Speira Monastery, and during an "accidental" visit there, pardoned Constantine and took him with him back to the palace. Samonas then resorted to another scheme: with his secretary
Constantine the Rhodian he produced a
pamphlet, supposedly written by Constantine, which insulted the emperor, and arranged for Leo to read it. His machinations, however, were betrayed by one of his fellow conspirators, and Samonas was dismissed, tonsured, and banished to the monastery of Martinakios in summer of 908. Constantine succeeded him as imperial . Leo gifted him with a monastery at Nosiai, which was inaugurated by the emperor and patriarch
Euthymius in person. ==Dismissal and restoration under Empress-regent Zoe==