Christian Heresies of the
Eighth Century:

Iconoclasts:
    Leo de Isaurian held that the veneration of sacred images was idolatry. This outbreak commenced about the year 723 and led to much violence. This error was condemned by thee Second Council of Nicea in the year 787.
    Iconoclast is a person who destroys icons, that is, sacred paintings or sculpture. Conversely, people who revere or venerate religious images are called iconodules.
    Iconoclasm (Eikonoklasmos, "Image-breaking") is the name of the heresy that in the eighth and ninth centuries disturbed the peace of the Eastern Church, caused the last of the many breaches with Rome that prepared the way for the schism of Photius in 858 and the Great Schism of the 11th century, and was echoed on a smaller scale in the Frankish kingdom in the West. The story in the East is divided into two separate persecutions of the Catholics, at the end of each of which stands the figure of an image-worshipping Empress (Irene and Theodora).
    This error was taken up by Islam and many Protestant Reformers.
    Iconoclasm, Catholic   Iconoclasm, general   Iconoclasts   Iconoclastic Crisis

Adoptionists:
    Elipandus, Archbishop of Toledo, Spain, claimed that Christ was born a human only, and was not divine until his baptism, at which point he was adopted as the Son by God the Father. It is a continuation of the Monarchians of the second century, please, look at it.