In the Iconoclastic era, figural mosaics were also condemned as idolatry. The Iconoclastic churches were embellished with plain gold mosaics with only one great cross in the apse like the Hagia Irene in Constantinople (after 740). There were similar crosses in the apses of the Hagia Sophia Church in Thessaloniki and in the Church of the Dormition in Nicaea. The crosses were substituted with the image of the Theotokos in both churches after the victory of the Iconodules (787797 and in 8th9th centuries respectively, the Dormition church was totally destroyed in 1922).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did the Hagia Irene adapt the iconoclastic era mosaics?
after 740