The term "Robber Council" refers to the Second Council of Nicaea, held in 787 AD. This council was convened to address the controversy surrounding the use of icons in Christian worship. It aimed to restore the veneration of icons, which had been rejected by the previous council, known as the Council of Hieria in 754 AD. The name "Robber Council" was given by its opponents, who believed that the council was illegitimate and manipulated by those in favor of icon veneration. This term reflects the ongoing theological and political conflicts within the early Christian Church regarding the role of images in worship.