He was born in Constantinople as the son of Theodore and Eudokia, of a strictly orthodox family, which had suffered from the earlier Iconoclasm. His father Theodore, one of the secretaries of Emperor Constantine V Kopronymos, had been scourged and banished to Nicaea for his zealous support of Iconodules, and the son inherited the religious convictions of the father. Nevertheless, he entered the service of the Empire, became cabinet secretary, and under Irene took part in the synod of 787 as imperial commissioner. He then withdrew to one of the cloisters that he had founded on the Propontis, until he was appointed director of the largest home for the destitute in Constantinople c. 802.