<P> Important works of luxury art from this period include the silver David Plates, produced during the reign of Heraclius, and depicting scenes from the life of the Hebrew king David . The most notable surviving manuscripts are Syriac gospel books, such as the so - called Syriac Bible of Paris . However, the London Canon Tables bear witness to the continuing production of lavish gospel books in Greek . </P> <P> The period between Justinian and iconoclasm saw major changes in the social and religious roles of images within Byzantium . The veneration of acheiropoieta, or holy images "not made by human hands," became a significant phenomenon, and in some instances these images were credited with saving cities from military assault . By the end of the seventh century, certain images of saints had come to be viewed as "windows" through which one could communicate with the figure depicted . Proskynesis before images is also attested in texts from the late seventh century . These developments mark the beginnings of a theology of icons . </P> <P> At the same time, the debate over the proper role of art in the decoration of churches intensified . Three canons of the Quinisext Council of 692 addressed controversies in this area: prohibition of the representation of the cross on church pavements (Canon 73), prohibition of the representation of Christ as a lamb (Canon 82), and a general injunction against "pictures, whether they are in paintings or in what way so ever, which attract the eye and corrupt the mind, and incite it to the enkindling of base pleasures" (Canon 100). </P> <P> Intense debate over the role of art in worship led eventually to the period of "Byzantine iconoclasm ." Sporadic outbreaks of iconoclasm on the part of local bishops are attested in Asia Minor during the 720s . In 726, an underwater earthquake between the islands of Thera and Therasia was interpreted by Emperor Leo III as a sign of God's anger, and may have led Leo to remove a famous icon of Christ from the Chalke Gate outside the imperial palace . However, iconoclasm probably did not become imperial policy until the reign of Leo's son, Constantine V . The Council of Hieria, convened under Constantine in 754, proscribed the manufacture of icons of Christ . This inaugurated the Iconoclastic period, which lasted, with interruptions, until 843 . </P>

List the two major influences on the byzantine style