Christian iconography

Christian art began, about two centuries after Christ, by borrowing motifs from Roman Imperial imagery, classical Greek and Roman religion and popular art - the motif of Christ in Majesty owes something to both Imperial portraits and depictions of Zeus. In the Late Antique period iconography began to be standardised, and to relate more closely to Biblical texts, although many gaps in the canonical Gospel narratives were plugged with matter from the apocryphal gospels. Eventually the Church would succeed in weeding most of these out, but some remain, like the ox and ass in the Nativity of Christ.
After the period of Byzantine iconoclasm iconographical innovation was regarded as unhealthy, if not heretical, in the Eastern Church, though it still continued at a glacial pace. More than in the West, traditional depictions were often considered to have authentic or miraculous origins, and the job of the artist was to copy them with as little deviation as possible. The Eastern church also never accepted the use of monumental high relief or free-standing sculpture, which it found too reminiscent of paganism. Most modern Eastern Orthodox icons are very close to their predecessors of a thousand years ago, though development, and some shifts in meaning, have occurred - for example the old man wearing a fleece in conversation with Saint Joseph usually seen in Orthodox Nativities seems to have begun as one of the shepherds, or the prophet Isaiah, but is now usually understood as the "Tempter".

In both East and West, numerous iconic types of Christ, Mary and saints and other subjects were developed; the number of named types of icons of Mary, with or without the infant Christ, was especially large in the East, whereas Christ Pantocrator was much the commonest image of Christ. Especially important depictions of Mary include the Hodegetria and Panagia types. Traditional models evolved for narrative paintings, including large cycles covering the events of the Life of Christ, the Life of the Virgin, parts of the Old Testament, and, increasingly, the lives of popular saints. Especially in the West, a system of attributes developed for identifying individual figures of saints by a standard appearance and symbolic objects held by them; in the East they were more likely to identified by text labels.

From the Romanesque period sculpture on churches became increasingly important in Western art, and probably partly because of the lack of Byzantine models, became the location of much iconographic innovation, along with the illuminated manuscript, which had already taken a decisively different direction from Byzantine equivalents, under the influence of Insular art and other factors. Developments in theology and devotional practice produced innovations like the subject of the Coronation of the Virgin and the Assumption, both associated with the Franciscans, as were many other developments. Most painters remained content to copy and slightly modify the works of others, and it is clear that the clergy, by whom or for whose churches most art was commissioned, often specified what they wanted shown in great detail.

The theory of typology, by which the meaning of most events of the Old Testament was understood as a "type" or pre-figuring of an event in the life of, or aspect of, Christ or Mary was often reflected in art, and in the later Middle Ages came to dominate the choice of Old Testament scenes in Western Christian art.
Whereas in the Romanesque and Gothic periods the great majority of religious art was intended to convey often complex religious messages as clearly as possible, with the arrival of Early Netherlandish painting iconography became highly sophisticated, and in many cases appears to be deliberately enigmatic, even for a well-educated contemporary. The subtle layers of meaning uncovered by modern iconographical research in works of Robert Campin such as the Mérode Altarpiece, and of Jan van Eyck such as the Madonna of Chancellor Rolin and the Washington Annunciation lie in small details of what are on first viewing very conventional representations. When Italian painting developed a taste for enigma, considerably later, it most often showed in secular compositions influenced by Renaissance Neo-Platonism.

From the 15th century religious painting gradually freed itself from the habit of following earlier compositional models, and by the 16th century ambitious artists were expected to find novel compositions for each subject, and direct borrowings from earlier artists are more often of the poses of individual figures than of whole compositions. The Reformation soon restricted most Protestant religious painting to Biblical scenes conceived along the lines of history painting, and after some decades the Catholic Council of Trent reined in somewhat the freedom of Catholic artists.

20th century iconography

In the early-twentieth century Germany, Aby Warburg and his followers Fritz Saxl and Erwin Panofsky elaborated the practice of identification and classification of motifs in images to using iconography as a means to understanding meaning. Panofsky codified an influential approach to iconography in his 1939 Studies in Iconology, where he defined it as "the branch of the history of art which concerns itself with the subject matter or meaning of works of art, as opposed to form," although the distinction he and other scholars drew between particular definitions of "iconography" (put simply, the identification of visual content) and "iconology" (the analysis of the meaning of that content), has not been generally accepted, though it is still used by some writers.

In the United States, where Panofsky immigrated in 1931, students such as Frederick Hartt, and Meyer Schapiro continued under his influence in the discipline. In an influential article of 1942, Introduction to an "Iconography of Mediaeval Architecture", Richard Krautheimer, a specialist on early medieval churches and another German émigré, extended iconographical analysis to architectural forms.

The period from 1940 can be seen as one where iconography was especially prominent in art history. Whereas most icongraphical scholarship remains highly dense and specialized, some analyses began to attract a much wider audience, for example Panofsky's theory that the writing on the rear wall in the Arnolfini Portrait by Jan van Eyck turned the painting into the record of a marriage contract. Holbein's The Ambassadors has been the subject of books for a general market with new theories as to its iconography, and the best-sellers of Dan Brown include theories, disowned by most art historians, on the iconography of works by Leonardo da Vinci.

Technological advances allowed the building-up of huge collections of photographs, with an iconographic arrangement or index, which include those of the Warburg Institute and the Index of Christian Art at Princeton (which has made a specialism of iconography since its early days in America). These are now being digitised and made available online, usually on a restricted basis.

With the arrival of computing, the Iconclass system, a highly complex way of classifying the content of images, with 28,000 classification types, and 14,000 keywords, was developed in the Netherlands as a standard classification for recording collections, with the idea of assembling huge databases that will allow the retrieval of images featuring particular details, subjects or other common factors. For example, the Iconclass code "71H7131" is for the subject of "Bathsheba with David's letter", whereas "71" is the whole "Old Testament" and "71H" the "story of David". A number of collections of different types have been classified using Iconclass, notably many types of old master print, the collections of the Gemäldegalerie, Berlin and the German Marburger Index. These are available, usually on-line or on DVD. The system can also be used outside pure art history, for example on sites like Flickr.