What was a key topic of discussion at the Council of Nicaea II?

The Council of Nicaea II, held in 787, primarily focused on the legitimacy of the veneration of icons in Christian worship. This council was convened to address the Iconoclast controversy, which revolved around the debate on whether or not it was appropriate to use images of Christ, the Virgin Mary, and the saints in worship. The council reaffirmed the significance of icons as tools for teaching and as means of expressing one's faith, declaring that the veneration of these sacred images was not idolatry but rather a way to honor what the images represent. Thus, the discussion regarding the veneration of icons was central to the council's purpose, making this topic a pivotal point in defining Christian practices and beliefs regarding religious imagery.