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The chief concerns of the council were the Frankish response to the Adoptionist movement in Spain and the Second Council of Nicaea (787), which had been held by the Byzantine Empress Irene of Athens and had dealt with iconoclasm and with which Charlemagne took issue because no Frankish churchmen had been invited. Ultimately, the council condemned the Adoptionist heresy and revoked the Nicene Council's decrees regarding holy icons, condemning both iconodulism (veneration of icons) and iconoclasm (destruction of icons), "allowing that images could be useful educational devices, but denying that they were worthy of veneration."